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Exciton Condensation in Bilayer Quantum Hall Systems

Eisenstein, J. P. (2014) Exciton Condensation in Bilayer Quantum Hall Systems. Annual Review of Condensed Matter Physics, 5 . pp. 159-181. ISSN 1947-5454. doi:10.1146/annurev-conmatphys-031113-133832.

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The condensation of excitons, bound electron-hole pairs in a solid, into a coherent collective electronic state was predicted more than 50 years ago. Perhaps surprisingly, the phenomenon was first observed in a system consisting of two closely spaced parallel two-dimensional electron gases in a semiconductor double quantum well. At an appropriate high magnetic field and low temperature, the bilayer electron system condenses into a state resembling a superconductor, only with the Cooper pairs replaced by excitons consisting of electrons in one layer bound to holes in the other. In spite of being charge neutral, the transport of excitons within the condensate gives rise to several spectacular electrical effects. This article describes these phenomena and examines how they inform our understanding of this unique phase of quantum electronic matter.

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Additional Information:© 2014 Annual Reviews. My thanks go to my students and postdocs Alex Champagne, Aaron Finck, Mindy Kellogg, Trupti Khaire, Debaleena Nandi, Ian Spielman, and Lisa Tracy for performing the Caltech portion of the experiments described here. They and I are indebted to Loren Pfeiffer and Ken West for growing numerous high-quality GaAs/AlGaAs heterostructures in support of our work. I also wish to thank Sankar Das Sarma, Steve Girvin, Gil Refael, Ady Stern, and Kun Yang for innumerable very helpful discussions. Allan MacDonald deserves special thanks for his sustained interest in the physics described here and his infinite patience in explaining so much of it to me. The Caltech work has been generously supported by grants from the National Science Foundation, the Department of Energy, and the Gordon and Betty Moore Foundation. Finally, it is a pleasure to thank the Tata Institute of Fundamental Research in Mumbai and the Indian Institute of Science in Bangalore for their kind hospitality while this article was being written.
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Department of Energy (DOE)UNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Subject Keywords:two-dimensional electron system; quantum wells; Landau levels; electron-hole pairing
Record Number:CaltechAUTHORS:20130618-085925694
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38964
Deposited By: Ruth Sustaita
Deposited On:18 Jun 2013 17:01
Last Modified:09 Nov 2021 23:41

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