Symmetry, Integrability and Geometry: Methods and Applications (SIGMA)


SIGMA 2 (2006), 025, 9 pages      cond-mat/0508282      http://dx.doi.org/10.3842/SIGMA.2006.025

Ordered Dissipative Structures in Exciton Systems in Semiconductor Quantum Wells

Andrey A. Chernyuk and Volodymyr I. Sugakov
Institute for Nuclear Research of NAS of Ukraine, 47 Nauky Ave., Kyiv, 03680 Ukraine

Received November 10, 2005, in final form February 08, 2006; Published online February 23, 2006

Abstract
A phenomenological theory of exciton condensation in conditions of inhomogeneous excitation is proposed. The theory is applied to the study of the development of an exciton luminescence ring and the ring fragmentation at macroscopical distances from the central excitation spot in coupled quantum wells. The transition between the fragmented and the continuous ring is considered. With assumption of a defect in the structure, a possibility of a localized island of the condensed phase in a fixed position is shown. Exciton density distribution is also analyzed in the case of two spatially separated spots of the laser excitation.

Key words: dissipative structures; exciton condensation; quantum wells.

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