Enhanced resonant backscattering of excitons in disordered quantum wells

Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023, 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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Abstract

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:	28 Oct 2022 08:36
URI:	https://orca.cardiff.ac.uk/id/eprint/71426

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