Resonant Rayleigh scattering on quantum well excitons: Theory and experiment
Time-resolved up-conversion measurements of secondary emission from multiple quantum wells under resonant femtosecond excitation are reported for GaAs multiple quantum wells with qualitatively different interface disorder. The transient resonant Rayleigh scattering presents very peculiar features such as a long-lived signal and a nonmonotonic behaviour, which cannot be explained by a classical model. A microscopic model is proposed, where the quantum mechanical equation for the microscopic polarization is solved numerically assuming a random two-dimensional potential with spatial correlation, and a phenomenological dephasing time. The model succeeds in reproducing the shape of the transients. It is shown that, for typical parameters of GaAs quantum well excitons, quantum mechanical features are essential in the description of the scattered intensity. The observed features of the signal are interpreted in terms of polarization beatings due to the energy quantization of exciton levels lying within the same fluctuation site.
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2000
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Swiss Fed Inst Technol, Dept Phys, EPFL, CH-1015 Lausanne, Switzerland. Savona, V, Swiss Fed Inst Technol, Dept Phys, EPFL, CH-1015 Lausanne, Switzerland.
ISI Document Delivery No.: 303TG
Cited Reference Count: 25
Cited References:
BARANOVSKII SD, 1978, SOV PHYS SEMICOND, V12, P1328
BARANOVSKII SD, 1993, PHYS REV B, V48, P17149
BRUNNER K, 1994, PHYS REV LETT, V73, P1138
BURKEDAL D, 1998, PHYS REV LETT, V81, P2372
CITRIN DS, 1996, PHYS REV B, V54, P14572
GAMMON D, 1996, PHYS REV LETT, V76, P3005
GARRO N, 1997, PHYS REV B, V55, P13752
GARRO N, 1999, PHYS REV B, V60, P4497
GURIOLI M, 1996, SOLID STATE COMMUN, V97, P389
GURIOLI M, 1997, PHYS REV LETT, V78, P3205
HAACKE S, P 24 INT C PHYS SEM
HAACKE S, 1997, PHYS REV LETT, V78, P2228
HAACKE S, 1998, OSA SER TRENDS OPT P, V18, P64
HEGARTY J, 1984, PHYS REV B, V30, P7346
HEGARTY J, 1985, J OPT SOC AM B, V2, P815
JAHN U, 1996, PHYS REV B, V54, P2733
LANGBEIN W, 1999, PHYS REV LETT, V82, P1040
LOUDON R, 1983, QUANTUM THEORY LIGHT
SAVONA V, 1999, PHYS REV B, V60, P4928
SHCHEGROV AV, 1999, PHYS REV LETT, V83, P1391
STOLZ H, 1993, PHYS REV B, V47, P9669
WANG HL, 1995, PHYS REV LETT, V74, P3065
WOERNER M, 1998, PHYS REV LETT, V81, P4208
ZIMMERMANN R, 1992, PHYS STATUS SOLIDI B, V173, P129
ZIMMERMANN R, 1995, NUOVO CIMENTO D, V17, P1801
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