Exciton spin dynamics in GaSe

Journal Article · Mon Sep 21 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4930809· OSTI ID:22489485

Tang, Yanhao; Xie, Wei; Mandal, Krishna C. ^[1]

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1. Department of Electrical Engineering, University of South Carolina, Columbia, South Carolina 29208 (United States)

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.

• OSTI ID: 22489485
• Journal Information: Journal of Applied Physics, Vol. 118, Issue 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
EXCITONS
GALLIUM SELENIDES
OPTICAL PUMPING
PHOTOLUMINESCENCE
POLARIZATION
RELAXATION
SPIN
SPIN FLIP
TIME DEPENDENCE