Exciton Liquid in Coupled Quantum Wells

Excitons in semiconductors may form correlated phases at low temperatures. We report the observation of an exciton liquid in gallium arsenide/aluminum gallium arsenide–coupled quantum wells. Above a critical density and below a critical temperature, the photogenerated electrons and holes separate in...

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Published inScience (American Association for the Advancement of Science) Vol. 343; no. 6166; pp. 55 - 57
Main Authors Stern, Michael, Umansky, Vladimir, Bar-Joseph, Israel
Format Journal Article
LanguageEnglish
Published United States American Association for the Advancement of Science 03.01.2014
The American Association for the Advancement of Science
Subjects
Aluminum
Density
Electrical phases
Electrical resistivity
Electrons
Excitons
Gallium
Laser power
Line spectra
Liquids
Low temperature
Luminescence
Mesas
Photoluminescence
Power lines
Quantum physics
Quantum theory
Quantum wells
semiconductors
Studies
temperature
Wells
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Summary:Excitons in semiconductors may form correlated phases at low temperatures. We report the observation of an exciton liquid in gallium arsenide/aluminum gallium arsenide–coupled quantum wells. Above a critical density and below a critical temperature, the photogenerated electrons and holes separate into two phases: an electron-hole plasma and an exciton liquid, with a clear sharp boundary between them. The two phases are characterized by distinct photoluminescence spectra and by different electrical conductance. The liquid phase is formed by the repulsive interaction between the dipolar excitons and exhibits a short-range order, which is manifested in the photoluminescence line shape.
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ISSN:0036-8075
1095-9203
1095-9203
DOI:10.1126/science.1243409