Bose-Einstein Condensation of Excitons in Bilayer Electron Systems

Details Bose-Einstein Condensation of Excitons in Bilayer Electron Systems Bose-Einstein Condensation of Excitons in Bilayer Electron Systems

2004-04-05

arxiv.org/abs/cond-mat/0404113v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

19 pages including 4 figures

Scientific paper

10.1038/nature03081

An ordered state of electrons in solids in which excitons condense was proposed many years ago as a theoretical possibility but has, until recently, never been observed. We review recent studies of semiconductor bilayer systems that provide clear evidence for this phenomenon and explain why exciton condensation in the quantum Hall regime, where these experiments were performed, is as likely to occur in electron-electron bilayers as in electron-hole bilayers. In current quantum Hall exciton condensates, disorder induces mobile vortices that flow in response to a supercurrent and limit the extremely large bilayer counterflow conductivity.

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