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    Wyświetlanie 1-11 z 11
    Tytuł:
    Trion Binding Energies and Wave Functions in Doped Quantum Wells
    Autorzy:
    Gładysiewicz, A.
    Wójcik, K.
    Wójs, A.
    Quinn, J. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043713.pdf
    Data publikacji:
    2005-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Pq
    71.35.Ji
    Opis:
    The energy spectra of negative trions (X$\text{}^{-}$=2e+h) in one-sided doped GaAs quantum wells are calculated. The maps of the trion binding energyΔ as a function of well width w, electron concentration n, and the magnetic field B are obtained. The dependence of the trion ground state ("bright singlet" versus "dark triplet") on those parameters is established.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 4; 669-674
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoluminescence of Charged Excitons in Fractional Quantum Hall Systems
    Autorzy:
    Wójs, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038337.pdf
    Data publikacji:
    2004-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Ji
    71.35.Ee
    71.35.Pq
    Opis:
    Neutral and charged excitonic complexes formed in integral and fractional quantum Hall systems are discussed. They are bound states of a small number of charged quasiparticles (e.g., conduction electrons and valence holes, reversed-spin electrons and spin holes, Laughlin quasielectrons and quasiholes, composite fermions) that occur in an electron system under specific conditions (electron density, well width, electric and magnetic fields, etc.). The examples are interband neutral and charged excitons, "anyon excitons", spin waves, skyrmions, and "skyrmion excitons". Their possible decay processes include radiative recombination, experimentally observed in photoluminescence or far infrared emission, or spin transitions, important in the context of nuclear spin relaxation.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 3; 355-366
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shake-Up Processes in Photoluminescence of Two-Dimensional Holes in a High Magnetic Field
    Autorzy:
    Wójs, A.
    Bryja, L.
    Misiewicz, J.
    Potemski, M.
    Reuter, D.
    Wieck, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047047.pdf
    Data publikacji:
    2006-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Cc
    71.35.Ji
    73.21.Fg
    Opis:
    Recombination of excitons and positive trions is studied by two-beam photoluminescence of a two-dimensional hole gas in a high magnetic field. The singlet, dark-triplet and bright-triplet states of a free trion are resolved, and their binding energies are determined. Recombination of acceptor-bound trions is also detected, including a low-energy cyclotron replica, corresponding to a hole shake-up process. Identification of all these different transitions was possible by analysis of optical selection rules and the comparison of experimental spectra with realistic numerical calculations.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 3; 429-435
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Numerical Analysis of Quasi-Two-Dimensional Negative and Positive Trions in High Magnetic Fields
    Autorzy:
    Trojnar, A.
    Wójs, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812000.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Pq
    71.35.Ji
    71.10.Pm
    Opis:
    Exact diagonalization calculations in the Haldane spherical geometry are carried out for the three-body Coulomb problem in a quasi-two-dimensional quantum well, in the presence of perpendicular magnetic field. Simultaneous inclusion of several Landau levels and quantum well subbands in the configuration-interaction basis allowed for quantitative description of the coupling between the in-plane dynamics (governed by interplay of cyclotron quantization and Coulomb interactions) and single-particle excitations in the normal direction. The energy spectra of negative and positive trions are compared in symmetric and asymmetric wells with realistic widths and carrier concentrations. Effects of nearby impurities are also studied.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1411-1416
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Experimental and Theoretical Studies of Free and Acceptor-Bound Positive Magneto-Trions
    Autorzy:
    Bryja, L.
    Wójs, A.
    Płochocka-Polack, P.
    Gładysiewicz, A.
    Misiewicz, J.
    Potemski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047714.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Cn
    71.35.Ji
    73.21.Fg
    Opis:
    By combination of polarization-resolved photoluminescence, transport, and realistic numerics we study energy and recombination spectra of free and acceptor-bound positive trions in a quasi-two-dimensional hole gas. The singlet-triplet crossing in the trion ground state is found at B≈12 T, and a slight reduction of all trion binding energies coincident with the formation of a Laughlin hole fluid is observed at B≈14.2 T.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 415-418
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation of Exciton and Trion Absorption Spectra in High Magnetic Fields
    Autorzy:
    Gładysiewicz, A.
    Wójs, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046912.pdf
    Data publikacji:
    2006-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Pq
    71.35.Ji
    71.10.Pm
    Opis:
    Density of states and absorption spectrum of narrow quantum wells containing a small number of free electrons and subject to a high magnetic field are calculated numerically. The effect of an additional, second electron on the photoexcited electron-hole pair is analyzed. In density of states, the exciton-electron interaction fills the gaps between the Landau levels and yields additional discrete peaks corresponding to bound trions. In absorption, interaction with the additional free electron has no effect on the position or intensity of the main sequence of excitonic peaks. However, it gives rise to additional weaker trion peaks, both in the lowest and higher Landau levels.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 2; 183-188
    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:
    Fractional Quasiexcitons in Photoluminescence of Quantum Hall Liquids
    Autorzy:
    Wójs, A.
    Gładysiewicz, A.
    Quinn, J. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044555.pdf
    Data publikacji:
    2005-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Pq
    71.35.Ji
    73.43.-f
    71.10.Pm
    Opis:
    Realistic calculations of photoluminescence spectra for a 20 nm quantum well at a filling factorν=1/3 are presented. The new states formed from charged excitons (trions) by correlation with the surrounding electrons are identified. These "quasiexcitons" differ from usual excitons and trions by having fractionally charged constituents. Their binding energies and emission intensities depend on the involved trion, leading to discontinuity in photoluminescence.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 5; 923-928
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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