Journal
JOURNAL OF LUMINESCENCE
Volume 132, Issue 11, Pages 2913-2916Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2012.06.004
Keywords
Exciton radiative lifetime; Quantum wells; Exciton-acoustic phonon interaction
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A simple microscopic mechanism explaining the linear dependence of the radiative lifetime of free-moving two-dimensional excitons on their effective temperature is suggested. It is shown that there exists a characteristic effective temperature (of about few Kelvin) defined by the exciton-acoustic phonon interaction at which the radiative lifetime is minimal. Below this temperature the lifetime starts to increase with decreasing temperature. The correspondence with previous theoretical and experimental results is discussed. (C) 2012 Elsevier B.V. All rights reserved.
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