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Advances in Condensed Matter Physics
Volume 2011, Article ID 938609, 7 pages
Review Article

Coherence and Optical Emission from Bilayer Exciton Condensates

Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA

Received 15 June 2010; Accepted 13 October 2010

Academic Editor: Emanuel Tutuc

Copyright © 2011 D. W. Snoke. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Experiments aimed at demonstrating Bose-Einstein condensation of excitons in two types of experiments with bilayer structures (coupled quantum wells) are reviewed, with an emphasis on the basic effects. Bose-Einstein condensation implies the existence of a macroscopic coherence, also known as off-diagonal long-range order, and proposed tests and past claims for coherence in these excitonic systems are discussed.