Optical signatures of energy-level statistics in a disordered quantum system

Time-resolved measurements of the resonant Rayleigh scattering from quantum well excitons are shown to provide information on the energy-level statistics of the localized exciton states. The signal transients are reproduced by a microscopic quantum model of the exciton two-dimensional motion in presence of spatially correlated disorder. This model allows quantitative determination of the average energy separation between the localized states. Here this quantity turns out to be only a few times smaller than the average disorder amplitude, proving that spatial correlation and quantum mechanics are equally important in the description of the exciton localization process.


Published in:
Physical Review Letters, 84, 1, 183-186
Year:
2000
ISSN:
0031-9007
Keywords:
Note:
Swiss Fed Inst Technol, Dept Phys, CH-1015 Lausanne, Switzerland. Savona, V, Swiss Fed Inst Technol, Dept Phys, CH-1015 Lausanne, Switzerland.
ISI Document Delivery No.: 271HJ
Times Cited: 28
Cited Reference Count: 32
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 Record created 2007-08-31, last modified 2018-03-18


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