Infoscience

Journal article

Photoluminescence study of V-groove quantum wires: The influence of disorder on the optical spectra and the carrier thermalization

We report on time-resolved and steady-state photoluminescence studies of GaAs/AlGaAs V-groove quantum wire structures. Steady-state photoluminescence experiments are performed in the temperature range from 8 to 200 It. We evaluate the relation between photoluminescence excitation and absorption and determine experimentally the optical density in order to analyze the temperature dependence of the photoluminescence spectra. We find that, at a temperature above 60 K, the photoexcited electron-hole pairs reach a thermal equilibrium at the lattice temperature while, at a temperature below about 60 K, they do not reach a quasi-equilibrium in the steady-state. Time-resolved photoluminescence studies performed at a carrier density of about 2 x 10(4) cm(-1) indicate that, at 60 K, a quasi-equilibrium is reached on a time scale of 10 ps. Furthermore, the hot carriers cool in about 100 ps to the lattice temperature. At 8 K, however, evidence of a non-thermal carrier distribution is found at the earliest times, which suggests that carriers in extended states are not in thermal equilibrium with carriers in localized states.

    Keywords: LIFETIMES

    Note:

    Ecole Polytech Fed Lausanne, Dept Phys, CH-1015 Lausanne, Switzerland. Oberli, DY, Ecole Polytech Fed Lausanne, Dept Phys, CH-1015 Lausanne, Switzerland.

    ISI Document Delivery No.: 303TG

    Times Cited: 8

    Cited Reference Count: 18

    Cited References:

    BELLESSA J, 1997, APPL PHYS LETT, V71, P2481

    CITRIN DS, 1993, PHYS REV B, V47, P3832

    FASOL G, 1993, PHYS REV LETT, V70, P3643

    GUSTAFSSON A, 1995, APPL PHYS LETT, V67, P3673

    HASEN J, 1997, NATURE, V390, P54

    HAUG H, 1984, PROG QUANT ELECTRON, V9, P3

    MONROE D, 1985, PHYS REV LETT, V54, P146

    NOIMA S, 1992, PHYS REV B, V46, P2302

    OBERLI DY, 1997, PHYS STATUS SOLIDI A, V164, P353

    OBERLI DY, 1999, PHYS REV B, V59, P2910

    PRENGEI E, 1999, PHYS REV B, V59, P5806

    PUGNET M, 1981, SOLID STATE COMMUN, V38, P531

    ROTA L, 1993, PHYS REV B, V47, P1632

    ROTA L, 1995, PHYS REV B, V52, P5183

    SIRENKO YM, 1994, PHYS REV B, V50, P4631

    VOUILLOZ F, 1998, PHYS REV B, V57, P12378

    WANG XL, 1997, APPL PHYS LETT, V71, P2130

    ZIMMERMANN R, 1996, P 23 INT C PHYS SEM, P1935

    Reference

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

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