Optical control of spin coherence in singly charged (In,Ga)As/GaAs quantum dots

被引：188

作者：

Greilich, A. ^{[1
]}

Oulton, R.

Zhukov, E. A.

Yugova, I. A.

Yakovlev, D. R.

Bayer, M.

Shabaev, A.

Efros, Al. L.

Merkulov, I. A.

Stavarache, V.

Reuter, D.

Wieck, A.

机构：

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

[2] USN, Res Lab, Washington, DC 20375 USA

[3] RAS, AF Ioffe Physicotech Inst, St Petersburg 194021, Russia

[4] Ruhr Univ Bochum, D-44780 Bochum, Germany

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

[6] St Petersburg State Univ, Inst Phys, St Petersburg 198504, Russia

[7] George Mason Univ, Sch Computat Sci, Fairfax, VA 22030 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.96.227401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Electron spin coherence has been generated optically in n-type modulation doped (In,Ga)As/GaAs quantum dots (QDs) which contain on average a single electron per dot. The coherence arises from resonant excitation of the QDs by circularly polarized laser pulses, creating a coherent superposition of an electron and a trion. Time dependent Faraday rotation is used to probe the spin precession of the optically oriented electrons about a transverse magnetic field. The coherence generation can be controlled by pulse intensity, being most efficient for (2n+1)pi pulses.

引用

页数：4

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