Electron spin polarization through interactions between excitons, trions, and the two-dimensional electron gas

被引：20

作者：

Chen, Z. ^{[1
]}

Bratschitsch, R.

Carter, S. G.

Cundiff, S. T.

Yakovlev, D. R.

Karczewski, G.

Wojtowicz, T.

Kossut, J.

机构：

[1] Univ Colorado, JILA, Boulder, CO 80309 USA

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

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

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

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

来源：

PHYSICAL REVIEW B | 2007年 / 75卷 / 11期

关键词：

D O I：

10.1103/PhysRevB.75.115320

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We use a two-color transient Kerr rotation technique to study the spin dynamics in an n-doped CdTe/Cd(0.85)Mg(0.15)Te quantum well. The dynamics displays the interplay between excitons, trions, and the two-dimensional electron gas. The spin relaxation of individual species is resolved by spectral selection. The spin dynamics are quantitatively described by rate equations involving the spin populations of excitons, trions, and the electron gas. Under resonant excitation of excitons, spin polarization of the electron gas is generated through trion formation, with the spin coherence partially lost through exciton spin relaxation. A maximum hole spin-flip time is observed around the trion resonance, with a rapid decrease for increasing excitation energy.

引用

页数：7

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