Spin coherence of a two-dimensional electron gas induced by resonant excitation of trions and excitons in CdTe/(Cd,Mg)Te quantum wells

被引：87

作者：

Zhukov, E. A. ^{[1
]}

Yakovlev, D. R.

Bayer, M.

Glazov, M. M.

Ivchenko, E. L.

Karczewski, G.

Wojtowicz, T.

Kossut, J.

机构：

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

[2] Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119992, Russia

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

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

来源：

PHYSICAL REVIEW B | 2007年 / 76卷 / 20期

关键词：

D O I：

10.1103/PhysRevB.76.205310

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The mechanisms for generation of long-lived spin coherence in a two-dimensional electron gas (2DEG) have been studied experimentally by means of a picosecond pump-probe Kerr rotation technique. CdTe/(Cd,Mg)Te quantum wells with a diluted 2DEG were investigated. The strong Coulomb interaction between electrons and holes, which results in large binding energies of neutral excitons and negatively charged excitons (trions), allows one to address selectively the exciton or trion states by resonant optical excitation. Different scenarios of spin coherence generation were analyzed theoretically, among them the direct trion photocreation, the formation of trions from photogenerated excitons, and the electron-exciton exchange scattering. Good agreement between experiment and theory is found.

引用

页数：16

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