Exciton spin dynamics in GaSe

被引：12

作者：

Tang, Yanhao ^{[1
]}

Xie, Wei ^{[1
]}

Mandal, Krishna C. ^{[2
]}

McGuire, John A. ^{[1
]}

Lai, Chih Wei ^{[1
]}

机构：

[1] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[2] Univ S Carolina, Dept Elect Engn, Columbia, SC 29208 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2015年 / 118卷 / 11期

基金：

美国国家科学基金会;

关键词：

GAAS QUANTUM-WELLS; EPSILON-GASE; RADIATIVE LIFETIMES; LATTICE-RELAXATION; OPTICAL-PROPERTIES; GALLIUM-ARSENIDE; SEMICONDUCTORS; ELECTRONS; CRYSTALS; ELECTROREFLECTANCE;

D O I：

10.1063/1.4930809

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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.

引用

页数：8

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