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Many-body interaction evidenced through exciton-trion-electron correlated dynamics

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.

    Keywords: QUANTUM-WELL STRUCTURES ; NEGATIVELY CHARGED EXCITONS ; OPTICAL-PROPERTIES ; BLUE SHIFT ; DEPENDENCE ; EVOLUTION ; DENSITY ; GAS

    Note:

    Ecole Polytech Fed Lausanne, Lab Photon & Elect Quant, CH-1015 Lausanne, Switzerland. Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland. Univ Calif Santa Barbara, IQUEST, Santa Barbara, CA 93106 USA. Portella-Oberli, MT, Ecole Polytech Fed Lausanne, Lab Photon & Elect Quant, CH-1015 Lausanne, Switzerland.

    ISI Document Delivery No.: 865EO

    Times Cited: 0

    Cited Reference Count: 29

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    Record created on 2007-08-31, modified on 2016-08-08

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