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Enhanced resonant backscattering of excitons in disordered quantum wells

Langbein, Wolfgang Werner, Runge, E., Savona, V. and Zimmermann, R. 2002. Enhanced resonant backscattering of excitons in disordered quantum wells. Physical Review Letters 89 (15) , pp. 157401-1. 10.1103/PhysRevLett.89.157401

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A clear signature of enhanced backscattering of excitons is observed in the directional resonant Rayleigh scattering of light from localized two-dimensional excitons in disordered quantum wells. Its spectral dependence and time dynamics are measured and theoretically predicted in a quantitative way. The intensity enhancement has a large momentum span extending beyond the external light emission cone. This is a consequence of the small localization length of the exciton as a massive particle probed close to the band bottom. The localization length can be controlled by the photon kinetic energy. This constitutes a qualitative difference to backscattering phenomena in other branches of physics.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: American Physical Society
ISSN: 0031-9007
Last Modified: 04 Jun 2017 08:00

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