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    Wyświetlanie 1-43 z 43
    Tytuł:
    Metoda badania własności statycznych i dynamicznych obiektowego oprogramowania symulacyjnego
    Object oriented simulator programs with static and dynamic properties analysis
    Autorzy:
    Gaj, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/305895.pdf
    Data publikacji:
    2008
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    symulacja
    własności obiektowego oprogramowania symulacyjnego
    simulation
    object-oriented properties
    static properties
    dynamic properties
    Opis:
    Artykuł dotyczy problemów badania własności obiektowych aplikacji symulacyjnych. W punkcie 2 opisano metody badania projektu aplikacji i jej kodu źródłowego. W rozdziale 3 opisano metody badania pracującej aplikacji obiektowej. Omówiono metody badania zjawisk zachodzących wewnątrz uruchomionej aplikacji symulacyjnej i w systemie operacyjnym.
    This article relates to the problems of research of the object-oriented properties of the simulator programs. Chapter 2 concerns the methods of research of application design and its source code. Chapter 3 describes the methods of research of running object-oriented application. It also shows the methods of research of events taking place inside running applications and its environment.
    Źródło:
    Biuletyn Instytutu Systemów Informatycznych; 2008, 1; 17-23
    1508-4183
    Pojawia się w:
    Biuletyn Instytutu Systemów Informatycznych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Semimagnetic Semiconductors
    Autorzy:
    Gaj, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011142.pdf
    Data publikacji:
    1999-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    78.20.Ls
    71.70.Gm
    75.30.Et
    Opis:
    This paper contains a description and explanation of selected basic phenomena characteristic of bulk semimagnetic semiconductors: giant Faraday rotation and giant Zeeman splitting, mean field approximation and its limitations, ion-ion interaction, its measurements and its influence on magnetic properties, etc. The basic part is followed by a discussion of a personal choice of new perspectives open by the introduction of diluted magnetic semiconductors in semiconductor quantum structures. In particular, the role of magnetic ions in characterization of semiconductor quantum structures and low-dimensional excitonic systems is analyzed. Particular attention is paid to magnetooptical phenomena and magnetooptical experimental methods in large gap II-VI semimagnetic semiconductors.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 5; 651-664
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of Exciton Zeeman Splittings in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te from Faraday Rotation Measurements
    Autorzy:
    Stachow, A.
    Nguyen, The Khoi
    Gaj, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933998.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Ls
    71.35.+z
    Opis:
    Reflectivity and Faraday rotation measurements were carried out on Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te bulk crystals in the complete zinc-blende range of composition 0 < x ≤ 0.71. From a comparison of the results of these two experiments for samples with x ≤ 0.3, we demonstrate that the Faraday angle Θ, measured in limited spectral range, is proportional to the energy splitting of exciton states ΔE, measured at the same temperature (2 K) and magnetic field B (up to 5 T). The determined proportionality constant was used to calculate ΔE values also for x > 0.3. This allowed us to find an empirical description of ΔE values for the whole range of compositions as a function of B and x.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 909-912
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scattering Dynamics of Excitons in ZnSe Based Semimagnetic Semiconductors
    Autorzy:
    Nguyen, The Khoi
    Mac, W.
    Gaj, J.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1921546.pdf
    Data publikacji:
    1992-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    78.30.Fs
    Opis:
    Resonant Raman scattering was measured for (Zn,Fe)Se and (Zn,Cr)Se with the magnetic ion mole fraction below 0.02. LO phonons and intra-Fe$\text{}^{++}$ transitions were observed. Polarization measurements versus magnetic field allowed to obtain polarization lifetimes (polariton flight times) in the sub-picosecond range.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 4; 634-636
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Dependence of the Energy Gap in Cd$\text{}_{1-x}$Fe$\text{}_{x}$Se
    Autorzy:
    Gaj, J. A.
    Nguyen, The Khoi
    Arciszewska, M.
    Lebecki, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1891022.pdf
    Data publikacji:
    1991-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    Opis:
    The energy gap and magnetic susceptibility of Cd$\text{}_{0.85}$Fe$\text{}_{0.15}$Se were measured in function of temperature. Experiments showed that the magnetic contribution to the variation of the energy gap in Cd$\text{}_{1-x}$Fe$\text{}_{x}$Se is not proportional to the product of magnetic susceptibility and temperature as it has been observed in Mn$\text{}^{++}$-containing semiconductors.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 3; 405-407
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Scattering Dynamics of Free Excitons on Fe$\text{}^{++}$ Ions in Cd$\text{}_{1-x}$Fe$\text{}_{x}$Se
    Autorzy:
    Gaj, J. A.
    Nguyen, The Khoi
    Nawrocki, M.
    Golnik, A.
    Lebecki, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1891231.pdf
    Data publikacji:
    1991-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    78.30.Fs
    Opis:
    Inelastic scattering of excitons on Fe$\text{}^{++}$ ions in Cd$\text{}_{1-x}$Fe$\text{}_{x}$Se was studied by resonant Raman scattering. Polarization measurements were done using a modulation technique, allowing for the first time to determine the full polarization state of the detected light. The obtained results were compared to a simple calculation in an incoherent model of scattering on Fe$\text{}^{++}$ ions.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 3; 409-412
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exchange Interaction in ZnCrSe Semimagnetic Semiconductor
    Autorzy:
    Mac, W.
    Nguyen, The Khoi
    Twardowski, A.
    Gaj, J. A.
    Demianiuk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1924249.pdf
    Data publikacji:
    1992-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    Opis:
    Magnetoreflectance and magnetization of ZnCrSe were measured for B ≤ 5 T and T = 2 K. A linear dependence between exciton splitting and magnetization was found. The s, p-d exchange parameter was estimated: N$\text{}_{0}$α-N$\text{}_{0}$β=0.67eV.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 5; 902-904
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Self-Assembled CdTe/ZnTe Quantum Dots
    Autorzy:
    Kowalik, K.
    Kudelski, A.
    Golnik, A.
    Gaj, J. A.
    Karczewski, G.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035754.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    71.70.Ej
    Opis:
    We present microluminescence investigations of self-assembled CdTe/ZnTe quantum dots. The dots proprieties resulting from our studies are: values of optical in-plane anisotropy parameters (electron - heavy hole exchange splitting and orientation of anisotropy) and value of effective Lande factor. Parameters giving information about in-plane anisotropy possess random distribution of values with the exchange splitting from 0 to 240 μeV. The effective Lande factor values for our dots are around g$\text{}^{*}$=-3.2 with a scatter of about 18%. Some PL lines exhibit sudden jumps of energetic position, related to variation of the charge state in their neighborhood.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 539-544
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetooptical Analysis of Interface Mixing in Pulsed Laser Evaporation and Epitaxy Grown CdTe/Cd$\text{}_{0.9}$Mn$\text{}_{0.1}$Te Multiple Quantum Well and Superlattice
    Autorzy:
    Lewalski, A.
    Nguyen, The Khoi
    Kossacki, P.
    Gaj, J. A.
    Dubowski, J. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929672.pdf
    Data publikacji:
    1993-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Dx
    78.20.Ls
    75.50.Pp
    Opis:
    A recently proposed magnetooptical method of determination of interface mixing was applied to CdTe/CdMnTe superstructures grown by pulsed laser evaporation and epitaxy. Diffusion length were found ≈ 5 Å for a multiple quantum well and > 15 Å for a superlattice. Ranges of Mn mole fractions and well width values enabling efficient application of the method were determined.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 3; 571-574
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoluminescence of a CdTe Quantum Dot with a Single Manganese Ion in Voigt Configuration
    Autorzy:
    Koperski, M.
    Goryca, M.
    Kazimierczuk, T.
    Kossacki, P.
    Wojnar, P.
    Gaj, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047960.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.La
    75.75.-c
    78.55.Et
    78.67.Hc
    Opis:
    We present a study of the neutral exciton and negative trion recombination spectra of an individual CdTe quantum dot with a single manganese ion, in magnetic field measured in the Voigt configuration. We describe experimental results and compare with a theoretical model. The quantitative agreement between the model and the experiment allows us to determine separately the electron g-factor.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 618-620
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Excitonic Giant Zeeman Effect in Wide Gap Diluted Magnetic Semiconductors Based on ZnO and GaN
    Autorzy:
    Pacuski, W.
    Ferrand, D.
    Kossacki, P.
    Marcet, S.
    Cibert, J.
    Gaj, J. A.
    Golnik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046983.pdf
    Data publikacji:
    2006-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.Hx
    78.20.Ls
    71.35.Ji
    Opis:
    We present a theoretical description of the excitonic giant Zeeman effect observed in wide gap diluted magnetic semiconductors (Zn,Co)O and (Ga,Mn)N. In these materials, A and B excitons present quite complex energy shifts and change of oscillator strengths under magnetic field. These features can be well reproduced using an excitonic Hamiltonian, taking into account ion-carrier exchange, wurtzite trigonal crystal field, spin-orbit and electron-hole exchange interactions.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 3; 303-309
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Faraday Rotation and Photoionization of ZnCrSe Semimagnetic Semiconductor
    Autorzy:
    Mac, W.
    Nguyen, The Khoi
    Gaj, J. A.
    Twardowski, A.
    Demianiuk, M.
    Stachow-Uciakowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929663.pdf
    Data publikacji:
    1993-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    Opis:
    The magnetoabsorption and the Faraday rotation of ZnCrSe were measured for B ≤ 5 T and T = 2 K in the region of photon energies lower than the fundamental absorption edge. The circular dichroism of the photoionization absorption bane was observed and analyzed. The Faraday rotation was interpreted as due to the sum of contributions from interband and photoionization optical transitions.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 3; 567-570
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Long Decays of Excitonic Photoluminescence from CdTe/ZnTe Individual Quantum Dots
    Autorzy:
    Piechal, B.
    Suffczyński, J.
    Trajnerowicz, A.
    Goryca, M.
    Kossacki, P.
    Golnik, A.
    Gaj, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044525.pdf
    Data publikacji:
    2005-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.47.+p
    78.67.Hc
    78.55.Et
    Opis:
    We present time-resolved micro-photoluminescence study of self-assembled CdTe/ZnTe quantum dots. In addition to the fast radiative decay of the exciton, we observe long components, being of the order of a few nanoseconds. We observe that long decays are present for neutral exciton lines as well as on the biexciton ones. The temperature dependent measurements reveal the non-monotonic behaviour. We find also that the long decays are not mono-exponential. We conclude that the dark exciton states cannot be treated as the only source of long decays in the luminescence. We propose other possible explanation, which is the slowing of luminescence by carrier trapping in high energy states in quantum dots and barriers.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 5; 831-836
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inter-Dot Coupling in a Self-Assembled Quantum Dot System
    Autorzy:
    Kazimierczuk, T.
    Nowak, S.
    Suffczyński, J.
    Wojnar, P.
    Golnik, A.
    Gaj, J. A.
    Kossacki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047689.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    78.55.Et
    Opis:
    We present studies of resonant excitation of self-assembled CdTe/ZnTe quantum dots. Photoluminescence excitation measurements revealed existence of sharp resonances, common for photoluminescence lines attributed to different quantum dot charge states. We conclude from the ensemble of photoluminescence and photoluminescence excitation results that we observe energy transfer in coupled quantum dot pairs.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 321-324
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Femtosecond Dynamics of Neutral and Charged Exciton Absorption in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te Quantum Well
    Autorzy:
    Płochocka, P.
    Kossacki, P.
    Maślana, W.
    Radzewicz, C.
    Gaj, J. A.
    Cibert, J.
    Tatarenko, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035611.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.Fy
    78.47.+p
    78.67.De
    Opis:
    We present a study of time-dependent transmission spectra of a modulation-doped Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te/Cd$\text{}_{1-y-z}$Zn$\text{}_{y}$Mg$\text{}_{z}$Te quantum well with variable hole gas concentration. We study the influence of pump pulses on excitonic absorption in subpicosecond time scale. A spectrally broad probe pulse of duration of 40 femtoseconds was used to record the absorption spectra at controlled delay. Studies of temporal evolution of exciton energies revealed coherence decay of linearly polarized excitons and thermalization of non-equilibrium exciton states. We found that a characteristic timescale for thermalization of non-equilibrium populations of photocreated excitons is between 0.8 and 3.6 ps. The timescale of this process depends on the hole concentration in quantum well: for higher hole concentration the decay is faster. Long-lived photo-induced magnetization accompanied by heating of the magnetic system was also observed.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 4-5; 679-686
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Many-Body Interactions in the CdTe-Based Quantum Well under Strong Optical Excitation
    Autorzy:
    Płochocka, P.
    Kossacki, P.
    Piechal, B.
    Maślana, W.
    Golnik, A.
    Cibert, J.
    Tatarenko, S.
    Gaj, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038365.pdf
    Data publikacji:
    2004-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.De
    71.35.Pq
    78.47.+p
    Opis:
    We performed pump-probe time-resolved absorption measurements on a modulation p-doped (Cd,Mn)Te quantum well. The density of the 2D hole gas was controlled, in the 10$\text{}^{10}$ cm$\text{}^{-2}$ range, by additional cw illumination. Interactions between photocreated neutral (X) and charged (X$\text{}^{+}$) excitons and the 2D hole gas were analyzed. We found that the strongest effect is the influence of the carriers on both X and X$\text{}^{+}$ optical resonances. Neutral and charged excitons are screened by holes, which results in the decrease in their intensities. We conclude from polarization resolved experiments that this screening is spin-dependent: it is more efficient between holes with opposite spins. Binding holes into the charged excitons reduces the screening of the neutral excitons and leads to an enhancement of the neutral exciton intensity. We also analyzed weaker effects, due to exciton-exciton interaction, at a constant hole density. We found that the reduction of the neutral exciton intensity due to two different mechanisms (phase-space filling and biexciton formation) is almost equal. We observed a spin-dependent blue shift of the neutral exciton line in the presence of a population of neutral excitons created by the pump pulse. Due to the attractive interaction between excitons with opposite spins, the corresponding shift of the neutral exciton is smaller than that observed due to the interaction between excitons with the same spins.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 3; 413-422
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement of Very Small Zeeman Splittings in GaN:Mn,Mg by Faraday Rotation
    Autorzy:
    Wołoś, A.
    Kossacki, P.
    Golnik, A.
    Kamińska, M.
    Gaj, J. A.
    Twardowski, A.
    Grzegory, I.
    Boćkowski, M.
    Porowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035615.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.Ls
    71.70.Ej
    71.55.Eq
    71.20.Nr
    Opis:
    In this work we demonstrate an application of Faraday rotation for measuring an extremely small Zeeman splitting of an Mn related absorption line placed at 1.417 eV in optical absorption spectrum of Mn and Mg doped gallium nitride. Analysis of the collected spectra allowed us to determine the value of the splitting as equal to 0.12±0.01 meV at 6 T. This data should help in establishing the nature of the observed absorption band.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 4-5; 695-699
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoluminescence of p-Doped Quantum Wells with Strong Spin Splitting
    Autorzy:
    Boukari, H.
    Kossacki, P.
    Bertolini, M.
    Ferrand, D.
    Cibert, J.
    Tatarenko, S.
    Gaj, J. A.
    Deveaud, B.
    Ciulin, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038307.pdf
    Data publikacji:
    2004-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.-y
    71.55.Gs
    73.21.Fg
    75.30.Hx
    75.50.Pp
    Opis:
    Photoluminescence of p-type modulation doped (Cd,Mn)Te quantum wells is studied with carrier density up to 5×10$\text{}^{11}$ cm$\text{}^{-2}$ at various spin splittings. This splitting can be made larger than the characteristic energies of the system thanks to the giant Zeeman effect. At small spin splitting and regardless of the carrier density, the photoluminescence exhibits a single line, which corresponds to the charged exciton in the singlet state. Above a certain spin splitting, the charged exciton is destabilized in favor of the exciton at vanishing hole density, and in favor of a double line at higher carrier density. It is found here that the charged exciton destabilization energy hardly depends on the carrier density. The double line is found to be band-to-band like, with the same initial state - where the holes have the same spin orientation - and final states that differ by some excitation of the 2D hole gas. In addition, the spin splitting needed to fully polarize the hole gas is twice smaller than expected from the single particle image and gives a unique insight into many-body effects in the hole gas.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 3; 299-310
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Configuration Mixing on Energies and Recombination Dynamics of Excitonic States in CdTe/ZnTe Quantum Dots
    Autorzy:
    Smoleński, T.
    Kazimierczuk, T.
    Goryca, M.
    Kossacki, P.
    Gaj, J. A.
    Wojnar, P.
    Fronc, K.
    Korkusiński, M.
    Hawrylak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047951.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    78.55.Et
    Opis:
    We study experimentally and theoretically excitonic recombination processes in CdTe/ZnTe quantum dots. The single quantum dot photoluminescence spectrum was observed and emission lines from X, X$\text{}^{-}$, X$\text{}^{+}$ and 2X excitonic states were identified. Experimental results were analysed in the theoretical model based on the effective mass approximation. Numerical calculations of energy positions and recombination probabilities of X, X$\text{}^{-}$, X$\text{}^{+}$ and 2X were performed. Computed results reproduce correctly the order and relative positions of emission lines and ratios of radiative lifetimes.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 615-617
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carrier Density Control by Illumination in Surface Doped, p-Type (Cd,Mn)Te Quantum Wells
    Autorzy:
    Maślana, W.
    Kossacki, P.
    Gaj, J. A.
    Ferrand, D.
    Bertolini, M.
    Tatarenko, S.
    Cibert, J.
    Kutrowski, M.
    Wojtowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046939.pdf
    Data publikacji:
    2006-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    78.67.De
    61.72.Vv
    Opis:
    We report both decrease and increase in the 2D carrier gas density in a simple (Cd,Mn)Te/(Cd,Mg)Te heterostructure with (Cd,Mn)Te quantum well. The two effects were achieved by light with different photon energies. The quantum wells were 10 nm wide with 2D hole gas supplied by surface states. For the sample with 25 nm cap layer thickness, it was possible to tune the hole gas concentration from almost empty well (hole density below 1×10$\text{}^{10}$ cm$\text{}^{-2}$) to 45×10$\text{}^{10}$ cm$\text{}^{-2}$. The illumination with 425 nm wavelength almost doubled the hole gas density from the initial 24×10$\text{}^{10}$ cm$\text{}^{-2}$. The depletion mechanism was most effective for illumination with the orange (575 nm) light.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 2; 255-262
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Excitation Mechanisms of CdTe/ZnTe Quantum Dots under Non-Resonant and Quasi-Resonant Regime
    Autorzy:
    Kazimierczuk, T.
    Gaj, J. A.
    Golnik, A.
    Goryca, M.
    Nawrocki, M.
    Koperski, M.
    Smoleński, T.
    Suffczyński, J.
    Wojnar, P.
    Kossacki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047917.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    78.55.Et
    Opis:
    We discuss possible mechanisms of quantum dot population control. A set of experiments, including time-resolved photoluminescence, single photon correlations, excitation correlation, and photoluminescence excitation is used to determine the actual mechanism under non-resonant and quasi-resonant regime.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 588-591
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Properties of CdTe QDs Formed Using Zn Induced Reorganization
    Autorzy:
    Kobak, J.
    Pacuski, W.
    Jakubczyk, T.
    Kazimierczuk, T.
    Golnik, A.
    Frank, K.
    Rosenauer, A.
    Kruse, C.
    Hommel, D.
    Gaj, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048054.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Ta
    78.67.Hc
    Opis:
    In this paper we present optical studies of CdTe quantum dots formed using Zn-induced reorganization. The pattern of quantum dot photoluminescence lines is found to be similar to typical results reported for quantum dots grown with other techniques, although the positively charged exciton line is relatively more pronounced. Also the energy spacing between biexciton and exciton lines is found to be larger than in typical results. Zn-induced reorganization results in quantum dots density higher by an order of magnitude than in Te-induced quantum dots.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 627-629
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of Ferromagnetism in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te Based Quantum Wells
    Autorzy:
    Bertolini, M.
    Boukari, H.
    Ferrand, D.
    Cibert, J.
    Tatarenko, S.
    Gilles, B.
    Maślana, W.
    Gaj, J. A.
    Kossacki, P.
    Dietl, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035587.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Hx
    75.50.Dd
    75.50.Pp
    78.55.Et
    Opis:
    New structures aiming at controlling the ferromagnetic properties of diluted magnetic semiconductor quantum wells are presented. The carrier density is controlled by applying a voltage across a p-i-n diode. A new method, creating a 2D hole gas by adjusting the distance between the quantum well and surface, offers opportunities for a broader range of structures.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 4-5; 603-608
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photon Correlations and Cross-Correlations from a Single CdTe/ZnTe Quantum Dot
    Autorzy:
    Couteau, C.
    Moehl, S.
    Suffczyński, J.
    Gaj, J. A.
    Tinjod, F.
    Gérard, J. M.
    Kheng, K.
    Mariette, H.
    Romestain, R.
    Poizat, J. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038216.pdf
    Data publikacji:
    2004-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    42.50.Dv
    Opis:
    We report correlation and cross-correlation continuous wave measurements in II-VI quantum dots grown by molecular beam epitaxy. Combination of spectral selection, saturation measurements and good temporal resolution allowed us to see an antibunching effect on photons from radiative recombination of excitons in a single CdTe/ZnTe quantum dot, as well as cross-correlation within the biexciton (X$\text{}_{2}$)-exciton (X) radiative cascade from the same dot. We discuss the results of our experiments in terms of a model of excitonic multitransitions.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 2; 169-176
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of Photon Polarization in GaAs/AlAs Single Quantum Dot Emission
    Autorzy:
    Suffczyński, J.
    Trajnerowicz, A.
    Kazimierczuk, T.
    Piętka, B.
    Kowalik, K.
    Kossacki, P.
    Golnik, A.
    Nawrocki, M.
    Gaj, J. A.
    Wysmołek, A.
    Stępniewski, R.
    Potemski, M.
    Thierry-Mieg, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047725.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Cr
    78.66.Fd
    78.67.Hc
    78.47.+p
    Opis:
    We study polarization resolved correlation between photons emitted in cascaded biexciton-exciton recombination from a single quantum dot formed in type II GaAs/AlAs bilayer. Magnetic field induced transition from anisotropy controlled to the Zeeman controlled emission was demonstrated by a circular polarization correlation between the emitted photons. A simple model describing the effect allowed us to determine the anisotropic exchange splitting of the excitonic state. This method of the anisotropic exchange splitting determination can be useful in the case when other methods are not sensitive enough.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 461-466
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MiR396 involvement in regulation of somatic embryogenesis in Arabidopsis
    Autorzy:
    Szczygiel-Sommer, A.
    Gaj, M.D.
    Powiązania:
    https://bibliotekanauki.pl/articles/80953.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    microRNA
    biogenesis
    gene expression
    eukaryotic organism
    hormone signalling
    environmental stress
    somatic embryogenesis
    Arabidopsis
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of different tillage systems on the macronutrient content and uptake in sugar beets
    Autorzy:
    Gaj, R.
    Budka, A.
    Przybyl, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/14411.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    plant cultivation
    tillage system
    macronutrient content
    macronutrient uptake
    sugar-beet
    conservation tillage
    nutrient content
    nutrient uptake
    Opis:
    The study, carried out in 2012-2013, intended to determine effects of different cultivation systems on the uptake and content of macronutrients (nitrogen, phosphorus, potassium, magnesium, calcium and sodium) in sugar beets at the technological maturity stage. A conventional tillage system (SO) was compared to simplified technologies of soil cultivation. The following conservation tillage systems were analyzed: (2) tillage to a depth of 35 cm and sowing into stubble mulch (MS35); (3) shallow tillage to a depth of 15 cm and sowing into stubble mulch (MS15); (4) tillage to a depth of 15 cm and sowing into white mustard mulch; (5) strip-till on stubble mulch to a depth of 25 cm and instantaneous beet seed sowing (STS); (6) strip-till to a depth of 25 cm on white mustard mulch and instantaneous beet seed sowing (STG). Mineral nutrient concentrations in beets varied depending on the cultivation system applied and the plant organ analyzed. The experimental factor significantly differentiated the content of P, K, Ca, Mg and Na in both beet leaves and roots, having no effect on the nitrogen content. When compared to the conventional tillage system, a decreasing trend for phosphorus and calcium in beet leaves and a significant increase of sodium both in beet leaves and roots was observed in the simplified cultivation systems. Cultivation simplifications provided some equivocal evidence implicating differences in the nutrient content between the study years. The analysis of correlations between root yields and the total accumulation of nutrients indicated significant relationships for N, P, K, Ca, Mg only in the conventional tillage system and in the treatment with 35 cm deep tillage (soil ripping) along with sowing into stubble mulch (MS35). In the other treatments, strong relationships were observed only for individual nutrients.
    Źródło:
    Journal of Elementology; 2015, 20, 4
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution of zinc in maize fertilized with different doses of phosphorus and potassium
    Autorzy:
    Bąk, K.
    Gaj, R.
    Budka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/962855.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Opis:
    Evaluation of the nutritional status of zinc and other micronutrients in maize at the critical growth stages is an important diagnostic and prognostic factor that plays a substantial role in shaping its final yield. A hypothesis was verified that the application of different phosphorus and potassium fertilization doses affected the nutritional status of zinc in maize at the critical growth stages: leaf development (BBCH 17) and flowering (BBCH 65), as well as the zinc accumulation at the stage of ripening (BBCH 89, fully ripe). A single factor field study was conducted for 5 consecutive plant growing seasons (2007-2011). The results showed that mineral fertilization significantly increased zinc concentration in maize leaves at BBCH 17 and BBCH 65 growth stages. Regardless of the effects of the experimental factor, the Zn leaf content in maize at both critical growth stages was much below the standard value. Although the zinc concentration observed at the leaf development stage was low, no significant relationship was found between the zinc nutritional status in maize at that time and the subsequent grain yield. Stronger relationships between the zinc nutritional status in maize and grain yield were observed at the flowering stage. The total accumulation of zinc in maize was significantly differentiated by the experimental factor. The chemical form of phosphorus applied had no significant effect on Zn content in maize at the critical growth stages as well as on the accumulation of this nutrient in fully ripe plants. The ZnHI value obtained in the control treatment was 51.7%, whereas the values achieved in fertilizer treatments were higher and ranged from 52.9% (W100 PAPR – with partially acidulated phosphate rock) to 57.3% (W25 – 25% of K and P recommended rate). Correlation analysis on maize yield and zinc accumulation showed that yield volumes were determined most strongly by zinc accumulation in maize vegetative organs (especially husk leaves).
    Źródło:
    Journal of Elementology; 2016, 21, 4
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of different tillage methods on the nutritional status, yield and quality of sugar beets
    Autorzy:
    Gaj, R.
    Budka, A.
    Niewiadomska, A.
    Przybyl, J.
    Mioduszewska, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/13890.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    different method
    tillage method
    mineral fertilization
    sugar-beet
    nutritional status
    yield
    quality
    Opis:
    Optimal nutrition of sugar beets at critical growth stages is one of the crucial factors for the achievement of their highest yield potential. In the present study, it was presumed that reduced systems of sugar beet cultivation had no effect on the plants’ nutritional status at critical growth stages, on their yield or technological quality. In 2012-2013, two series of one-factorial field experiments with different beet crop husbandry were carried out in order to verify this hypothesis. The cultivation systems of sugar beet crops differed in the postharvest cultivation technology, mulch types and seedbed tillage. Conservation tillage systems were compared with the control treatment, which represented the conventional cultivation system with an application of manure and 35 cm deep autumn ploughing. The plant nutritional status assessment was carried out at two dates corresponding to the following growth stages: BBCH 16/17 (6-8 fully unfolded true leaves) and BBCH 39/40 (row closing). Regardless of the methods of tillage or the year of observation, the results showed that the plants at BBCH16/17 stage were well-nourished with macroelements but malnourished with microelements, mainly iron and zinc. The microelement deficiency in the plants was a result of adjusted soil reaction, which varied from slightly acidic to neutral. At the BBCH 39/40 stage, there was a decreasing trend in the content of leaf macronutrients in the no-tillage systems treatments compared to the conventional tillage with the ploughing depth to 35 cm and manure application. The reduced tillage systems in sugar beet cultivation did not result in either a yield decrease or a worse technological quality of roots. The experimental factor had no significant effect on the content of molassegenic compounds in beet roots. A decreasing trend was observed in the content of α-amino nitrogen and potassium when compared to the traditional cultivation system. The study showed that the choice of a cultivation technology is of secondary importance as long as the plant grows in optimal conditions resulting from an appropriate site selection.
    Źródło:
    Journal of Elementology; 2015, 20, 3
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ zróżnicowanych metod uprawy na zawartość i pobranie mikroskładników przez buraki cukrowe
    The effect of different tillage methods on micronutrient content and uptake in sugar beets
    Autorzy:
    Gaj, R.
    Budka, A.
    Przybyl, J.
    Murawska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/807420.pdf
    Data publikacji:
    2015
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Opis:
    Celem przeprowadzonych badań w latach 2012-2013 było określenie wpływu różnych metod uprawy roli na zawartość i pobranie cynku, miedzi, manganu i żelaza przez buraki cukrowe w fazie dojrzałości technologicznej. Doświadczenie założono w układzie bloków losowanych kompletnych. Analizie porównawczej poddano system tradycyjnej uprawy orkowej z pięcioma technologiami uprawy uproszczonej. Zastosowane metody uprawy istotnie różnicowały zawartość analizowanych mikroskładników zarówno w liściach, jak i w korzeniach buraków cukrowych. Analiza korelacji między zawartością mikroskładników w badanych organach dla poszczególnych wariantów uprawowych a plonem korzeni buraków wykazała duże zróżnicowanie i brak jednoznacznego związku. Stwierdzono istotny wpływ zawartości żelaza i manganu w liściach i korzeniach buraków na kształtowanie zawartości cukru w korzeniach w fazie dojrzałości technologicznej. Pod wpływem zastosowanych uproszczeń uprawowych odnotowano tendencję do spadku akumulacji składników w korzeniach w porównaniu do wariantu uprawy klasycznej.
    The aim of the study carried out in 2012-2013 was to determine the effects of different soil cultivation methods on the contents and uptake of zinc, copper, manganese and iron in sugar beets at the stage of technological maturity. The experiment was arranged following the randomized complete block design. Six soil cultivation systems were compared: (1) conventional tillage (SO); (2) tillage to a depth of 35 cm and sowing into stubble mulch (MS35); (3) shallow tillage to a depth of 15 cm and sowing into stubble mulch (MS15); (4) tillage to a depth of 15 cm and sowing into white mustard mulch (MG); (5) strip-till on stubble mulch to a depth of 25 cm and instantaneous beet seed sowing (STS); (6) strip-till to a depth of 25 cm on white mustard mulch and instantaneous beet seed sowing (STG). Experimental factor effects on the content of mineral nutrients, their accumulation in plant organs and the rate of nutrient uptake were tested by ANOVA procedure. The results of the study showed that conservation tillage had significant effects on the contents of the micro-nutrients analyzed both in sugar beet leaves and roots when compared to sugar beets grown in the conventional system. Significant differences with regard to plant micronutrient contents were also observed between the conservation (reduced) tillage systems. Regardless of the cultivation treatment applied, zinc content in the roots was positively correlated with sugar beet yield obtained. Besides, there was also observed a significant effect of iron and manganese contents in sugar beet leaves and roots on shaping root sugar contents at the stage of technological maturity. Regardless of the tillage method used, 50-80% of the total micronutrient uptake was accumulated in sugar beet roots. Correlation analysis taking into account relationships between micronutrient accumulation in beet leaves and roots and root yield carried out for individual soil cultivation treatments showed strong correlations for zinc. The total accumulation of nutrients was also differentiated with reference to the study years. The difference was for the most part evident in the case of zinc. Notwithstanding the cultivation methods applied, in the first year of the study, nutrient removal with harvest was almost 3-fold higher when compared to that in the second year. The results obtained evidently indicate that preparing appropriate recommendations for micronutrient fertilization requires consideration of each field individually.
    Źródło:
    Zeszyty Problemowe Postępów Nauk Rolniczych; 2015, 580
    0084-5477
    Pojawia się w:
    Zeszyty Problemowe Postępów Nauk Rolniczych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Immature zygotic embryo cultures of Arabidopsis. A model system for molecular studies on morphogenic pathways induced in vitro
    Autorzy:
    Kraut, M.
    Wojcikowska, B.
    Ledwon, A.
    Gaj, M.D.
    Powiązania:
    https://bibliotekanauki.pl/articles/19556.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    To understand the molecular mechanism controlling in vitro plant morphogenesis, a culture system enabling induction of alternative morphogenic pathways (somatic embryogenesis, SE; shoot organogenesis, ORG) in a well defined population of somatic cells is needed. Arabidopsis is the most useful model plant for genomic studies, but a system in which SE or ORG can be induced alternatively in the same type of explant has not been proposed. Immature zygotic embryos (IZEs) of Arabidopsis provide the only explants with embryogenic potential, and have been recommended for studying mechanisms of SE induced in vitro. This study was aimed at defining culture conditions promoting induction of alternative morphogenic pathways: shoot ORG in IZE explants. The established protocol involves pretreatment of IZE explants with liquid auxin-rich callus induction (CIM) medium, followed by subculture on solid cytokinin-rich shoot induction medium (SIM). The method enables efficient shoot induction in Columbia (Col-0) and Wassilewskija (Ws), genotypes commonly used in molecular studies. During 3 weeks of culture up to 90% of Col-0 and 70% of Ws explants regenerated shoots via an indirect morphogenic pathway. We analyzed the qRT-PCR expression patterns of the LEC (LEC1, LEC2 and FUS3) genes, the key regulators of Arabidopsis embryogenesis, in the IZE explants induced to promote shoot ORG. The sharp decline of LEC expression on SIM medium confirmed that culture of Arabidopsis IZE explants enables experimental manipulation of the morphogenic response of somatic cells. A scheme illustrating various in vitro morphogenic responses of IZEs in relation to hormonal treatment is presented.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2011, 53, 2
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnesium and calcium distribution in maize under differentiated doses of mineral fertilization with phosphorus and potassium
    Autorzy:
    Gaj, R.
    Budka, A.
    Gorski, D.
    Borowiak, K.
    Wolna-Maruwka, A.
    Bak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/14113.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Źródło:
    Journal of Elementology; 2018, 23, 1
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anisotropic Exchange Interaction between p-Shell Electron and s-Shell Hole in CdTe/ZnTe Quantum Dots
    Autorzy:
    Kazimierczuk, T.
    Golnik, A.
    Goryca, M.
    Wojnar, P.
    Gaj, J.
    Kossacki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791334.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    78.55.Et
    Opis:
    We study electron-hole exchange interaction in a single CdTe/ZnTe quantum dot by polarization-resolved photoluminescence measurements. We focus on recombination of excitonic states involving p-shell electrons: $X^{2-}$ and $XX^-$. Recombination lines of $X^{2-}$ and $XX^-$ states exhibit fine structure, which can be consistently explained within a model with four parameters $δ_{i}^{αβ}$ representing strength of iso- and anisotropic parts of interaction between s-hole and s- or p-electron.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 882-884
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of Local Electric Fields Influencing the Photoluminescence οf an Individual CdTe/ZnTe Quantum Dot
    Autorzy:
    Haas, K.
    Kazimierczuk, T.
    Wojnar, P.
    Golnik, A.
    Gaj, J.
    Kossacki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791340.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    78.55.Et
    Opis:
    We examine the influence of a weak non-resonant illumination on the quantum dot photoluminescence spectrum. We observe that even very weak illumination affects both intensity and spectral position of emission lines in the spectrum. We discover no significant asymmetry in spatial dependence and infer that the observed effects cannot be attributed to a single neighbor center.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 896-898
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetization Dynamics of a (Cd,Mn)Te Quantum Well in Pulsed Magnetic Field
    Autorzy:
    Kobak, J.
    Goryca, M.
    Kossacki, P.
    Golnik, A.
    Karczewski, G.
    Wojtowicz, T.
    Gaj, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791344.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    71.70.Gm
    78.55.Et
    75.75.-c
    Opis:
    In this paper we present studies of magnetization relaxation in a (Cd,Mn)Te quantum well containing 3.2% of Mn, after a pulse of magnetic field. The relaxation was found to be very fast, with dominant component faster than 10 ns. Upon application of static magnetic field the relaxation does not slow down, in contrast with the behavior of very diluted quantum wells or bulk material.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 907-908
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of an Electric Field on Fine Properties of III-V and II-VI Quantum Dots Systems
    Autorzy:
    Kowalik, K.
    Krebs, O.
    Kudelski, A.
    Golnik, A.
    Lemaître, A.
    Senellart, P.
    Karczewski, G.
    Kossut, J.
    Gaj, J.
    Voisin, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038219.pdf
    Data publikacji:
    2004-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    71.70.Ej
    Opis:
    We investigate the influence of an electric field on the optical properties of single quantum dots. For sample made of III-V compounds micron-size electro-optical structures were produced in order to apply an electric field in the dot plane. For several individual dots lines significant variations of the anisotropic exchange splitting with the field were observed. On sample made of II-VI compounds we demonstrate the influence of electric field fluctuations on the luminescence of a single quantum dot.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 2; 177-184
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Rate Equation Approach to Picosecond Charge State Dynamics in CdTe/ZnTe Quantum Dots
    Autorzy:
    Koperski, M.
    Kazimierczuk, T.
    Goryca, M.
    Wojnar, P.
    Golnik, A.
    Kossacki, P.
    Gaj, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791339.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Et
    73.21.La
    Opis:
    The rate equation is used for description of photoluminescence dynamics after pulsed excitation of various states of quantum dots. The picosecond dynamics of averaged charge state of quantum dot is described. We compare our simulations with the experiment and come up with the conclusion that probability of carrier capture weakly depends on quantum dot charge state and that electrons and holes are captured non-synchronously.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 893-895
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical Study of the Inter-Dot Excitation Transfer in CdTe/ZnTe Quantum Dots
    Autorzy:
    Koperski, M.
    Kazimierczuk, T.
    Goryca, M.
    Golnik, A.
    Gaj, J.
    Nawrocki, M.
    Wojnar, P.
    Kossacki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492874.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    78.55.Et
    Opis:
    In this work we present a statistical study of resonantly excited luminescence of coupled CdTe/ZnTe quantum dots studied by photoluminescence excitation measurements. We investigate the probability of resonance occurrence as a function of resonant energy. We come to the conclusion that the distribution of the inter-dot resonances is uniform, which suggests that the inter-dot excitation transfer is not limited by mean density of states in the emitting quantum dots.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 880-882
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single-Photon Emission from a Highly Excited CdTe Quantum Dot
    Autorzy:
    Nowak, S.
    Goryca, M.
    Kazimierczuk, T.
    Gaj, J.
    Golnik, A.
    Kossacki, P.
    Wojnar, P.
    Karczewski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811969.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.La
    78.55.Et
    78.67.-n
    78.47.-p
    Opis:
    Time-resolved correlation measurements were performed to examine the statistics of photon emission from a single quantum dot at high excitation levels. The range of strong powers was determined by the saturation of intensity of excitonic lines. The significant contribution of pulsed background luminescence forced us to sophisticated analysis of the photoluminescence spectra. For quantum dots grown in the Stranski-Krastanov mode, one-photon emission was found to a good approximation. Fluctuation type quantum dots exhibit a significant level of multiphoton emission.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1273-1278
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin-Related Spectroscopy of CdTe-Based Quantum Dots
    Autorzy:
    Gaj, J.
    Kazimierczuk, T.
    Goryca, M.
    Koperski, M.
    Golnik, A.
    Kossacki, P.
    Nawrocki, M.
    Wojnar, P.
    Karczewski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1585136.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    71.70.Gm
    75.75.+a
    78.55.Et
    Opis:
    This work contains a selection of our recent experimental results in the field of the spin-related spectroscopy of individual CdTe-based quantum dots. After a short description of the sample growth and experimental methods, optical measurements of the charge state dynamics are presented. Then the influence of in-plane anisotropy of the excitonic states of a quantum dot is discussed, followed by a description of experimental studies of information read-out and writing on quantum dot spin states. In particular, spin memory of a single $Mn^{++}$ ion embedded in a CdTe quantum dot is quantitatively assessed. In an outlook part, perspectives opened by recently developed ZnTe lattice-matched Bragg reflectors are discussed.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 795-799
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Study of ZnTe-Based 2D and 0D Photonic Structures Containing CdTe/ZnTe Quantum Dots
    Autorzy:
    Jakubczyk, T.
    Kazimierczuk, T.
    Golnik, A.
    Bienias, P.
    Pacuski, W.
    Kruse, C.
    Hommel, D.
    Kłopotowski, Ł.
    Wojtowicz, T.
    Gaj, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791336.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Pt
    Opis:
    We report on an optical study of ZnTe-based microcavity and micropillars. Angle-resolved reflectivity studies confirm a high quality of the investigated structure by setting the lower bound on the quality factor Q ≥ 1000, determined from normal-incidence reflection spectra. In a microphotoluminescence study, micropillar modes are observed at temperatures of the order of tens of kelvins. For structures grown by a complex growth procedure at two different MBE facilities, an enhancement of photoluminescence in the cavity mode is observed.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 888-889
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetooptical Properties of (Ga,Fe)N Layers
    Autorzy:
    Papierska, J.
    Rousset, J.
    Pacuski, W.
    Kossacki, P.
    Golnik, A.
    Nawrocki, M.
    Gaj, J.
    Suffczyński, J.
    Kowalik, I.
    Stefanowicz, W.
    Sawicki, M.
    Dietl, T.
    Navarro-Quezada, A.
    Faina, B.
    Li, T.
    Bonanni, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492954.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.Hx
    78.20.Ls
    71.35.Ji
    Opis:
    Magnetooptical properties of (Ga,Fe)N layers containing various concentrations of Fe-rich nanocrystals embedded in paramagnetic (Ga,Fe)N layers are reported. Previous studies of such samples demonstrated that magnetization consists of a paramagnetic contribution due to substitutional diluted Fe ions as well as of ferromagnetic and antiferromagnetic components originating from Fe-rich nanocrystals, whose relative abundance can be controlled by the growth conditions. The nanocrystals are found to broaden and to reduce the magnitude of the excitonic features. However, the ferromagnetic contribution, clearly seen in SQUID magnetometry, is not revealed by magnetic circular dichroism. Possible reasons for differences in magnetic response determined by magnetic circular dichroism and SQUID measurements are discussed.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 921-923
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-43 z 43

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