Exciton spin dynamics in GaSe
作者： Yanhao Tang , Wei Xie , Krishna C. Mandal , John A. McGuire , Chih Wei Lai
DOI: 10.1063/1.4930809
关键词: Condensed matter physics 、 Atomic physics 、 Physics 、 Circular polarization 、 Non-equilibrium thermodynamics 、 Biexciton 、 Time constant 、 Photoluminescence 、 Optical pumping 、 Exciton 、 Spin polarization
摘要: We analyze exciton spin dynamics in GaSe under nonresonant circularly polarized optical pumping with an spin-flip rate-equation model. The model reproduces time-dependent photoluminescence measurements which the initial circular polarization approaches unity even when 0.15 eV excess energy. At T = 10 K, relaxation exhibits a biexponential decay sub-20 ps and >500 time constants, are also reproduced by assuming distinct spin-relaxation rates for hot (nonequilibrium) cold band-edge excitons.
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