Spin relaxation and thermalization of excitons in GaAs quantum wells
作者:
T. C. Damen,
Karl Leo,
Jagdeep Shah,
J. E. Cunningham,
期刊:
Applied Physics Letters
(AIP Available online 1991)
卷期:
Volume 58,
issue 17
页码: 1902-1904
ISSN:0003-6951
年代: 1991
DOI:10.1063/1.105068
出版商: AIP
数据来源: AIP
摘要:
We present results on the picosecond dynamics of spin relaxation and thermalization of excitons in GaAs quantum wells. The spin relaxation time constant is ≊50 ps for resonant excitation and less than 10 ps for nonresonant excitation, considerably shorter than those for free electrons in the bulk. Photoexcited cold, nonthermal excitons thermalize in ≊50 ps at 10 K and less than 10 ps at 35 K. Exciton‐acoustic phonon energy exchange rates are determined from these measurements.
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