Exciton spin dynamics in GaSe

Abstract

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 a sub-20 ps and a >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.

8 pages, 6 figures

References in corpus (4)

• Spin splitting in 2D monochalcogenide semiconductors
• Optical Spin Polarization Dynamics in GaSe Nanoslabs
• Near Unity Optical Spin Polarization in GaSe Nanoslabs
• Hole spin relaxation in intrinsic and $p$-type bulk GaAs

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• Layer- and Frequency-Dependent Second Harmonic Generation in Reflection from GaSe Atomic Crystals
• Quantum kinetic equations for the ultrafast spin dynamics of excitons in diluted magnetic semiconductor quantum wells after optical excitation
• Trend reversal in the magnetic-field dependence of exciton spin-transfer rates in diluted magnetic semiconductors due to non-Markovian dynamics
• Linearly polarized remote-edge luminescence in GaSe nanoslabs