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Title: Exciton spin dynamics in GaSe

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.
Authors:
; ; ;  [1] ;  [2]
  1. Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 (United States)
  2. Department of Electrical Engineering, University of South Carolina, Columbia, South Carolina 29208 (United States)
Publication Date:
OSTI Identifier:
22489485
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; EXCITONS; GALLIUM SELENIDES; OPTICAL PUMPING; PHOTOLUMINESCENCE; POLARIZATION; RELAXATION; SPIN; SPIN FLIP; TIME DEPENDENCE