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.
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页数：4
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