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    Wyświetlanie 1-3 z 3
    Tytuł:
    Many-Body Interaction Evidenced through Exciton-Trion-Electron Correlated Dynamics
    Autorzy:
    Portella-Oberli, M. T.
    Berney, J. H.
    Deveaud, B.
    Ciulin, V.
    Kutrowski, M.
    Wojtowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038371.pdf
    Data publikacji:
    2004-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Pq
    78.47.+p
    42.65.-k
    78.67.De
    Opis:
    Interactions among excitons, trions, and electrons are studied in CdTe modulation-doped quantum wells. These many-body interactions are investigated through the nonlinear dynamical properties in the excitonic complexes using time and spectrally resolved pump and probe techniques. This study is performed as a function of temperature and densities of excitons, trions, and electrons. The results reveal that the nonlinearities induced by trions differ from those induced by excitons and moreover they are mutually correlated. The correlated behavior of excitons and trions manifests itself by crossed trion-exciton effects. We propose that the main source of these correlations is due to the presence of electrons in the quantum well and that its physical origin is the Pauli exclusion-principle. We find that, at 5 K, trions are formed from excitons within 10 ps; at 20 K a thermal equilibrium is reached within 5 ps.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 3; 423-434
    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:
    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 1-3 z 3

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