期刊
JOURNAL OF APPLIED PHYSICS
卷 118, 期 11, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4930809
关键词
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资金
- NSF [DMR-09055944]
- J. Cowen endowment at Michigan State University
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0955944] Funding Source: National Science Foundation
We analyze exciton spin dynamics in GaSe under nonresonant circularly polarized optical pumping with an exciton spin-flip rate-equation model. The model reproduces polarized time-dependent photoluminescence measurements in which the initial circular polarization approaches unity even when pumping with 0.15 eV excess energy. At T = 10 K, the exciton spin relaxation exhibits a biexponential decay with sub-20 ps and >500 ps time constants, which are also reproduced by the rate-equation model assuming distinct spin-relaxation rates for hot (nonequilibrium) and cold band-edge excitons. (C) 2015 AIP Publishing LLC.
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