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    Wyświetlanie 1-12 z 12
    Tytuł:
    Quantum Dots - Theory for Experiments
    Autorzy:
    Jacak, L.
    Krasnyj, J.
    Wójs, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1967993.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Dx
    71.35.Ji
    78.20.Ls
    Opis:
    A simple model based on the effective-mass method and treating a quantum dot as a small irregularity of the periodic crystal field is developed and used for the description of the radiative recombination of an exciton captured in that quasi-zero-dimensional structure. The additional peaks appearing in the photoluminescence spectra at the critical quantum dot size are predicted as a consequence of the metastable excited states occurring in the energy spectrum of a confined exciton. The obtained dependence of the photoluminescence spectrum on the dot size and magnetic field reproduces well the available experimental results.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 633-640
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exciton Trions in II-VI Heterostructures
    Autorzy:
    Cox, R. T.
    Huard, V.
    Kheng, K.
    Lovisa, S.
    Miller, R. B.
    Saminadayar, K.
    Arnoult, A.
    Cibert, J.
    Tatarenko, S.
    Potemski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968984.pdf
    Data publikacji:
    1998-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Dx
    78.66.Hf
    71.35.Ji
    78.20.Ls
    Opis:
    Optical spectra associated with transitions that create or annihilate charged excitons X$\text{}^{-}$ or X$\text{}^{+}$ can be observed in quantum well heterostructures containing an electron gas or a hole gas, respectively. A review is given of properties of trion states in CdTe quantum wells in zero field and of the magnetic field-dependence of the circular polarization and oscillator strength of the trion optical resonance. The possibility that disorder is needed to stabilise trion states in concentrated 2D electron or hole systems is discussed.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 2; 99-109
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Excitonic Polaritons in Transverse Magnetic Fields
    Autorzy:
    Loginov, D.
    Kochereshko, V. P.
    Litvinov, A.
    Besombes, L.
    Mariette, H.
    Davies, J. J.
    Smith, L. C.
    Wolverson, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047705.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.-y
    71.35.Ji
    78.20.Ls
    78.67.De
    Opis:
    Reflectivity spectra taken from wide quantum wells based on CdTe/CdZnTe and GaAs/AlGaAs (in which the well width is much larger than the exciton Bohr radius) were studied in magnetic fields in the plane of the well (the Voigt geometry). The energy splitting between bright and dark excitons and the redistribution of the oscillator strength from bright to dark was observed and this allowed us to determine the exciton exchange constantΔ. We found that exciton translational mass depends on the value of magnetic field. Additionally, we found that diamagnetic shift also depends on exciton wave vector. Changes in the spectra in the range of the overlap of heavy and light hole exciton resonances were observed when the magnetic field was inverted. Theoretical modeling of the spectra allowed us to explain all the observed features in the reflectivity spectra and to determine some material parameters.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 381-386
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combined Exciton-Cyclotron Resonance in Photoluminescence of a Two-Dimensional Hole Gas
    Autorzy:
    Jadczak, J.
    Bryja, L.
    Płochocka, P.
    Wójs, A.
    Misiewicz, J.
    Maude, D.
    Potemski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791299.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Mf
    71.35.Ji
    71.35.Pq
    78.20.Ls
    Opis:
    A two-dimensional hole gas in an asymmetric GaAs/$Ga_{1-x}Al_{x}As$ quantum well is studied by polarization-resolved photoluminescence in high magnetic fields (up to B = 20 T) and at low temperatures (down to T = 50 mK). In addition to the previously reported dominant emission channels of various free and acceptor-bound trions, the high-energy hole cyclotron replicas of the bound states are now also observed, corresponding to the combined exciton-cyclotron resonance. Identification of different transitions in the rich, multi-peak spectra was possible by the analysis of optical selection rules and comparison of the experimental spectra with realistic numerical calculations.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 852-853
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evidence of Singlet-Triplet Crossing in Photoluminescence of Positively Charged Excitons in GaAs Quantum Wells
    Autorzy:
    Bryja, L.
    Wójs, A.
    Jadczak, J.
    Misiewicz, J.
    Płochocka, P.
    Potemski, M.
    Reuter, D.
    Wieck, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811918.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Mf
    71.35.Ji
    71.35.Pq
    78.20.Ls
    Opis:
    Positively charged excitons in a two-dimensional hole gas in symmetric and asymmetric GaAs/$Ga_{1-x}Al_{x}As$ quantum wells are studied in polarization-resolved photoluminescence experiments in high magnetic fields B (up to 23 T) and low temperatures (down to 300 mK). The experiments are accompanied by numerical calculations of a real structure. The whole family of trions (the singlet and a pair of triplets) are observed. The Coulomb energies crossing of singlet and triplet is found: hidden in symmetric and visible in asymmetric structures.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1073-1077
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exciton Exchange between Nearly-Free and Acceptor-Bound States of a Positive Trion Assisted by Cyclotron Excitation
    Autorzy:
    Jadczak, J.
    Bryja, L.
    Wójs, A.
    Bartsch, G.
    Yakovlev, D. R.
    Bayer, M.
    Plochocka, P.
    Potemski, M.
    Reuter, D.
    Wieck, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047925.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Mf
    71.35.Ji
    71.35.Pq
    78.20.Ls
    Opis:
    In magneto-photoluminescence spectra of a two-dimensional hole gas in a GaAs quantum well we observe coupling of two different radiative states. The pair of coupled states are an acceptor-bound trion AX$\text{}^{+}$ and an essentially free (only weakly localized by a shallow lateral potential) trion X$\text{}^{+}$, brought into resonance by an additional cyclotron excitation controlled by the magnetic field. The coupling mechanism is the exciton transfer, and the optical signature is a clear anticrossing of the emission lines of an X$\text{}^{+}$ and a cyclotron replica of the AX$\text{}^{+}$.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 600-601
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MBE Growth and Magnetooptical Properties of (Zn,Co)Te Layers
    Autorzy:
    Papaj, M.
    Kobak, J.
    Rousset, J.
    Janik, E.
    Golnik, A.
    Kossacki, P.
    Pacuski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1403629.pdf
    Data publikacji:
    2012-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.30.Hx
    78.20.Ls
    71.35.Ji
    Opis:
    We report on epitaxial growth of diluted magnetic semiconductor (Zn,Co)Te. Reflectivity spectra reveal excitonic transition which split under magnetic field due to giant Zeeman effect. Magnetooptical effects can be described using literature data.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 6; 1010-1011
    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
    Tytuł:
    Motional Enhancement of Exciton Magnetic Moments
    Autorzy:
    Litvinov, A.
    Kochereshko, V.
    Cox, R. T.
    Besombes, L.
    Mariette, H.
    Boukari, H.
    Loginov, D.
    Davies, J. J.
    Smith, L. C.
    Wolverson, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047370.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Cc
    71.35.Ji
    71.36.+c
    78.20.Ls
    Opis:
    The phenomenon in which giant enhancement of exciton magnetic moments occurs due to translational motion was found for light hole excitons in ZnTe/ZnMgTe quantum well structures. Decreasing diamagnetic shifts as the number of the exciton quantized state increases were found for the first time.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 161-165
    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:
    Optical Anisotropy of Quantum Disks in the External Static Magnetic Field
    Autorzy:
    Schillak, P.
    Czajkowski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811986.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Cc
    71.35.Ji
    73.21.La
    78.20.Ls
    78.67.Hc
    Opis:
    We show how to compute the optical functions (the complex magneto-susceptibility, dielectric function, magneto-reflection and ellipsometric spectra) for semiconductor quantum disks exposed to a uniform magnetic field in the growth direction, including the excitonic effects. The optical response is calculated for an oblique incidence of the propagating electromagnetic wave and for input waves with different polarization. The method uses the microscopic calculation of nanostructure excitonic wave functions and energy levels, and the macroscopic real density matrix approach to compute the electromagnetic fields and susceptibilities. The electron-hole screened Coulomb potential is adapted and the valence band structure is taken into account in the cylindrical approximation, thus separating light- and heavy-hole motions. The novelty of our approach is that the solution is obtained in terms of known one-particle electron and hole eigenfunctions, since, in the considered nanostructure due to confinement effects accompanied by the e-h Coulomb interaction, the separation of the relative- and center-of-mass motion is not possible. We obtain both the eigenvalues and the eigenfunctions. The convergence of the proposed method is examined. We calculate the magnetooptical functions, including the optical Stokes parameters and ellipsometric functions for the case of oblique incidence. Numerical calculations were performed for InAs (disk)/ GaAs (barrier) disks. A good agreement with experiments was obtained.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1349-1354
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Field Induced Redistribution of Exciton-Polariton Density on Confined Modes
    Autorzy:
    Piętka, B.
    Szczytko, J.
    Łusakowski, J.
    Nardin, G.
    Léger, Y.
    Morier-Genoud, F.
    Deveaud-Plédran, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1409612.pdf
    Data publikacji:
    2012-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.36.+c
    42.55.Sa
    71.35.-y
    71.35.Ji
    78.20.Ls
    Opis:
    The influence of magnetic field on confined exciton-polariton modes inside a semiconductor microcavity is discussed. The three-dimensional confinement for exciton-polaritons is achieved by the mesa structures confining the photonic part of polaritons. We observe a strong increase of the polariton emission intensity and we argue that this effect is due to the change of the oscillator strength of the excitonic component of polaritons and the change of the excitonic content in polariton state as the magnetic field increases.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 6; 1093-1095
    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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