Electron spin coherence in n-doped CdTe/CdMgTe quantum wells

被引：18

作者：

Bratschitsch, R. ^{[1
]}

Chen, Z.

Cundiff, S. T.

Zhukov, E. A.

Yakovlev, D. R.

Bayer, M.

Karczewski, G.

Wojtowicz, T.

Kossut, J.

机构：

[1] Natl Inst Stand & Technol, JILA, Boulder, CO 80309 USA

[2] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

[3] Univ Dortmund, D-44221 Dortmund, Germany

[4] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland

[5] AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia

来源：

APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 22期

基金：

俄罗斯基础研究基金会; 美国国家科学基金会;

关键词：

D O I：

10.1063/1.2397552

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The spin coherence of a two-dimensional electron gas (2DEG) at different densities in CdTe/Cd0.85Mg0.15Te quantum wells has been examined by the time-resolved Kerr rotation technique using resonant excitation of either trions or excitons. The formation of negatively charged trions, either excited resonantly or via exciton states, causes strong spin polarization of the 2DEG. This effect leads to a long lasting exponential decay in the nanosecond regime. Spin dephasing times T-2(*) of the 2DEG measured as a function of electron density up to 2.4x10(11) cm(-2) show a nonmonotonic behavior with a maximum at 8x10(10) cm(-2). (c) 2006 American Institute of Physics.

引用

页数：3

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