Pattern formation of indirect excitons in coupled quantum wells

Details Pattern formation of indirect excitons in coupled quantum wells Pattern formation of indirect excitons in coupled quantum wells

2006-04-25

arxiv.org/abs/cond-mat/0604564v2

J. Phys. Condens. Matter 18 (2006) 9659~9668

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 Revtex4 pages, 3 figures

Scientific paper

10.1088/0953-8984/18/42/012

Using a nonlinear Schr\"odinger equation including short-range two-body attraction and three-body repulsion, we investigate the spatial distribution of indirect excitons in semiconductor coupled quantum wells. The results obtained can interpret the experimental phenomenon that annular exciton cloud first contracts then expands when the number of confined excitons is increased in impurity potential well, as observed by Lai \emph{et al.} [Lai $et al.$, Science \textbf{303}, 503 (2004)]. In particular, the model reconciles the patterns of exciton rings reported by Butov \emph{et al.} [Butov $et al.$, Nature \textbf{418}, 751 (2002)]. At higher densities, the model predicts much richer patterns, which could be tested by future experiments.

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