Special Reviews

Spontaneous Bose Coherence of Excitons and Polaritons

Science  15 Nov 2002:
Vol. 298, Issue 5597, pp. 1368-1372
DOI: 10.1126/science.1078082

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Abstract

In the past decade, there has been an increasing number of experiments on spontaneous Bose coherence of excitons and polaritons. Four major areas of research are reviewed here: three-dimensional excitons in the bulk semiconductor Cu2O, two-dimensional excitons in coupled quantum wells, Coulomb drag experiments in coupled two-dimensional electron gases, and polaritons in semiconductor microcavities. The unifying theory of all these experiments is the effect of spontaneous symmetry breaking in the Bose-Einstein condensation phase transition.

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