Spin relaxation and thermalization of excitons in GaAs quantum wells
- 29 April 1991
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 58 (17) , 1902-1904
- https://doi.org/10.1063/1.105068
Abstract
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.Keywords
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