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    Wyświetlanie 1-12 z 12
    Tytuł:
    Hot Photoluminescence in CdTe/CdMnTe Quantum Well Structures Grown by Molecular Beam Epitaxy
    Autorzy:
    Godlewski, M.
    Wojtowicz, T.
    Karczewski, G.
    Kossut, J.
    Bergman, J. P.
    Holtz, P. O.
    Monemar, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968096.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.47.+p
    78.55.Et
    Opis:
    A step-like emission is observed for CdTe/CdMnTe structures δ-doped with In. The new photoluminescence cannot be explained by neither the Raman process nor by the "ordinary" hot photoluminescence. We propose that magnetic interactions are responsible for the new photoluminescence appearing due to a dramatic increase in a thermalization time of hot excitons.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 765-768
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recombination Processes in Doped CdTe/CdMnTe Multiple Quantum Well Structures Grown by Molecular Beam Epitaxy
    Autorzy:
    Godlewski, M.
    Wojtowicz, T.
    Karczewski, G.
    Kossut, J.
    Bergman, J. P.
    Monemar, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968089.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.47.+p
    78.55.Et
    Opis:
    An influence of doping level on exciton properties in n-doped multiple quantum well structures of CdTe/CdMnTe is studied for multiple quantum well structures prepared in the way that donor (indium) concentration changes within the length of the sample. We show that the formation scenario for neutral donor bound excitons in low-dimensional structures can be different from that observed in bulk samples. We further show that in the case of such quantum well structures we can selectively excite either photoluminescence emission of localized or donor bound excitons, which is a consequence of surprisingly weak energy transfer link between two types of excitonic transitions.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 757-760
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exciton Transfer in Multiple Quantum Well Structures of CdTe/CdMnTe Grown by Molecular Beam Epitaxy
    Autorzy:
    Godlewski, M.
    Surma, M.
    Wilamowski, Z.
    Wojtowicz, T.
    Karczewski, G.
    Kossut, J.
    Holtz, P. O.
    Bergman, J. P.
    Monemar, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968091.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.47.+p
    78.55.Et
    Opis:
    The direct evidence for the efficient transfer of excitons from 4 nm and 6 nm to 10 nm wide CdTe quantum wells is presented based on the results of photoluminescence and photoluminescence excitation investigation. Efficient transfer is observed for quantum wells separated by thick (50 nm) CdMnTe barriers containing 10% or 30% Mn fraction. A new mechanism of the transfer is proposed, which involves long range dynamic magnetic interactions between free/bound excitons and Mn ions in the CdMnTe barrier regions of the structure.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 761-764
    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:
    Luminescence Decay in Deep Quantum Wells CdTe/Cd_{0.5}Mn_{0.5}Te at Room Temperature
    Autorzy:
    Kowalczyk, L.
    Fancey, S.
    Buller, G.
    Massa, J.
    Kutrowski, M.
    Janik, E.
    Karczewski, G.
    Wojtowicz, T.
    Zakrzewski, A.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1876908.pdf
    Data publikacji:
    1995-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Hf
    78.47.+p
    78.55.Et
    Opis:
    Time-resolved photoluminescence was used to study exciton recombination in deep CdTe/Cd_{0.5}Mn_{0.5}Te single quantum well. The width of the investigated well was 100 A. The study was performed at room temperature. The lifetime of the exciton determined in this work has a value comparable to that observed in shallow CdTe/Cd_{0.85}Mn_{0.15}Te quantum wells. A strong enhancement of the photoluminescence decay time with increasing intensity of the exciting laser beam is observed which is indicative of saturation of the non-radiative recombination centers.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 2; 508-513
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Observation of Second-Generation Nonequilibrium Phonons in Highly Photoexcited CdS Microcrystals
    Autorzy:
    Kurilc̆ik, G.
    Strumskis, M.
    Jurs̆ėnas, S.
    Z̆ukauskas, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952036.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.Kr
    78.47.+p
    78.55.Et
    Opis:
    Luminescence kinetics of nonthermalized electron-hole plasma in highly excited CdS microcrystals embedded in glass was studied at T=295 K using two pump pulses technique. The observed carrier kinetics shows additional increase in the effective temperature during the pump pulse as a result of the prepump pulse. The increase is shown to be produced by a fusion of long-lived second-generation nonequilibrium phonons generated by the prepump pulse. The experimental results are in good agreement with a model of hot electron-hole plasma energy relaxation with a build-up of two generations of nonequilibrium phonons.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 875-878
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Optical Properties of CdTe/CdMnTe Quantum Wells Grown by Molecular Beam and Atomic Layer Epitaxy
    Autorzy:
    Godlewski, M.
    Kopalko, K.
    Wojtowicz, T.
    Karczewski, G.
    Kossut, J.
    Bergman, J. P.
    Monemar, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952470.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.+z
    78.47.+p
    78.55.Et
    Opis:
    Optical properties of a series of CdTe/CdMnTe multi quantum well structures grown with MBE and ALE (CdTe quantum wells only) methods are compared. Based on the results of the photoluminescence experiments we conclude that the ALE growth leads to a different lateral scale of quantum well width fluctuations, which results in different exciton properties in two multi quantum well systems studied. In the wells grown with ALE method excitons are less localized. They can migrate in a quantum well plane between quantum well regions varying in thickness by 1 monolayer.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 1012-1016
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation Time of Magnetic Polarons
    Autorzy:
    Dietl, T.
    Peyla, P.
    Grieshaber, W.
    Merle d'Aubigné, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1872800.pdf
    Data publikacji:
    1995-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.47.+p
    78.55.Et
    75.50.Rr
    Opis:
    It is shown that non-scalar spin-spin interactions rather than spin-lattice coupling or spin diffusion control the dynamics of the magnetization formation visible in time-resolved luminescence and SQUID magnetometry.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 2; 361-364
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    From Magnetic Polarons to Ferromagnetism
    Autorzy:
    Dietl, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968985.pdf
    Data publikacji:
    1998-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.47.+p
    75.70.Cn
    78.55.Et
    78.66.Hf
    Opis:
    A brief overview is given on selected effects of the exchange coupling between effective mass electrons and localized spins in II-VI semiconductors containing Mn ions. In the case of a carrier or exciton trapped by an impurity or defect, the exchange interaction leads to zero-field spin-splitting. The current theory of such complexes, known as bound magnetic polarons, describes correctly their spectroscopic and thermodynamic properties as well as their formation dynamics. At the same time, a free magnetic polaron - a delocalized carrier accompanied by a traveling cloud of polarized spins - is not expected to exist for the actual values of the coupling constants. However, hole scattering by thermodynamic and static fluctuations is shown to affect significantly its energy. For a strong coupling, the corresponding renormalization has to be described by a non-perturbative approach. Finally, the influence of the carrier liquid upon the Mn spins is discussed. Here, either optical pumping or p-type doping may lead to a ferromagnetic order, both in bulk and layered structures. Because of a long-range character of the carrier mediated interactions, this ordering is not destroyed by the fluctuations, even in the reduced dimensionality systems.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 2; 111-123
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth and Characterization of ZnO Nanoparticles
    Autorzy:
    Tomaszewska-Grzęda, A.
    Łojkowski, W.
    Godlewski, M.
    Yatsunenko, S.
    Drozdowicz-Tomsia, K.
    Goldys, E. M.
    Phillips, M. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044547.pdf
    Data publikacji:
    2005-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Wx
    68.37.Hk
    78.55.Et
    78.47.+p
    Opis:
    In this work we evaluate structural and optical properties of ZnO nanoparticles grown by wet chemistry method. Light emission properties of these nanoparticles are studied with cathodoluminescence and micro-photoluminescence. Even at the room temperature excitonic emission is well resolved, due to high exciton binding energy of ZnO. Decay kinetics of photoluminescence emissions and efficiency of inter-nanoparticles energy migration is evaluated from maps of in-plane variations of photoluminescence decay times measured in microphotoluminescence setup.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 5; 897-902
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopic Studies of Charged Excitons
    Autorzy:
    Kossacki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2027473.pdf
    Data publikacji:
    2001-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Mf
    78.40.Fy
    78.55.Et
    78.47.+p
    78.67.De
    Opis:
    A brief review is given of optical experiments related to creation and recombination of charged excitons. Their results are analyzed in terms of a simple three-particle free trion model. It is shown that the simple model explains well such results as temperature variation of lifetime and absorption intensity or photoluminescence line shape and a decrease in absorption oscillator strength per carrier with increasing carrier concentration. The range of applicability of the simple model is examined and found to be limited by two factors: disorder-induced localization and many-body interactions occurring and high carrier sheet concentrations (of order of 10$\text{}^{11}$ cm$\text{}^{-2}$).
    Źródło:
    Acta Physica Polonica A; 2001, 100, 2; 237-248
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of Light Emission in CdMnS Nanoparticles
    Autorzy:
    Godlewski, M.
    Yatsunenko, S.
    Drozdowicz-Tomsia, K.
    Goldys, E. M.
    Phillips, M. R.
    Klar, P. J.
    Heimbrodt, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043717.pdf
    Data publikacji:
    2005-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Wx
    78.55.Et
    78.47.+p
    71.55.Gs
    76.30.Fc
    76.70.Hb
    Opis:
    We demonstrate coexistence of slow and fast components of photoluminescence decay of the Mn$\text{}^{2+}$ intra-shell emission in nanoparticles of CdMnS. We explain the observed decrease in PL lifetime of the Mn$\text{}^{2+}$ intra-shell transition by high efficiency of spin dependent magnetic interactions between localized spins of Mn$\text{}^{2+}$ ions and free carriers. This mechanism is enhanced in nanostructures, but it is also present in bulk samples.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 4; 681-688
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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