Exciton drag and drift induced by a two-dimensional electron gas

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We show theoretically that an electric current in a high-mobility quasi-two-dimensional electron layer induces a significant drift of excitons in an adjacent layer through interlayer Coulomb interaction. The exciton gas is shown to drift with a velocity which can be a significant fraction of the electron drift velocity at low temperatures. The estimated drift length is of the order of micrometers or larger during the typical exciton lifetime for GaAs/AlxGa1-xAs double quantum wells. A possible enhancement of the exciton radiative lifetime due to the drift is discussed.
Publisher
AMERICAN PHYSICAL SOC
Issue Date
2005-03
Language
English
Article Type
Article
Keywords

QUANTUM-WELL STRUCTURES; TEMPERATURE-DEPENDENCE; ENERGY-TRANSFER; GAAS; RECOMBINATION; LIFETIMES

Citation

PHYSICAL REVIEW B, v.71, pp.250 - 253

ISSN
1098-0121
URI
http://hdl.handle.net/10203/87597
Appears in Collection
RIMS Journal Papers
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