Nanosecond Spin Coherence Time of Nonradiative Excitons in GaAs/AlGaAs Quantum Wells

被引：16

作者：

Trifonov, A., V ^{[1
]}

Khramtsov, E. S. ^{[1
]}

Kavokin, K., V ^{[1
]}

Ignatiev, I., V ^{[1
]}

Kavokin, A., V ^{[1
,2
,3
]}

Efimov, Y. P. ^{[4
]}

Eliseev, S. A. ^{[4
]}

Shapochkin, P. Yu ^{[4
]}

Bayer, M. ^{[5
,6
]}

机构：

[1] St Petersburg State Univ, Spin Opt Lab, St Petersburg 198504, Russia

[2] Westlake Univ, 18 Shilongshan Rd, Hangzhou 310024, Zhejiang, Peoples R China

[3] Westlake Inst Adv Study, Inst Nat Sci, 18 Shilongshan Rd, Hangzhou 310024, Zhejiang, Peoples R China

[4] St Petersburg State Univ, Resource Ctr Nanophoton, St Petersburg 198504, Russia

[5] Tech Univ Dortmund, Expt Phys 2, D-44221 Dortmund, Germany

[6] Russian Acad Sci, AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 14期

基金：

俄罗斯基础研究基金会;

关键词：

DYNAMICS; DEPENDENCE; RELAXATION; ELECTRONS; EXCHANGE;

D O I：

10.1103/PhysRevLett.122.147401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on the experimental evidence for a nanosecond timescale spin memory based on nonradiative excitons with large in-plane wave vector. The effect manifests itself in magnetic-field-induced oscillations of the energy of the optically active (radiative) excitons. The oscillations detected by a spectrally resolved pump-probe technique applied to a GaAs/AlGaAs quantum well structure in a transverse magnetic field persist over a timescale, which is orders of magnitude longer than the characteristic decoherence time in the system. The effect is attributed to the spin-dependent electron-electron exchange interaction of the optically active and inactive excitons. The spin relaxation time of the electrons belonging to nonradiative excitons appears to be much longer than the hole spin relaxation time.

引用

页数：6

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