Collective single-mode precession of electron spins in an ensemble of singly charged (In,Ga)As/GaAs quantum dots

被引：31

作者：

Greilich, A. ^{[1
]}

Spatzek, S. ^{[1
]}

Yugova, I. A. ^{[2
]}

Akimov, I. A. ^{[1
,3
]}

Yakovlev, D. R. ^{[1
,3
]}

Efros, Al. L. ^{[4
]}

Reuter, D. ^{[5
]}

Wieck, A. D. ^{[5
]}

Bayer, M. ^{[1
]}

机构：

[1] Tech Univ Dortmund, Expt Phys 2, D-44221 Dortmund, Germany

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

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

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

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

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 20期

关键词：

electron spin; gallium arsenide; g-factor; III-V semiconductors; indium compounds; magnetic moments; semiconductor quantum dots;

D O I：

10.1103/PhysRevB.79.201305

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We show that the spins of all electrons in an ensemble of singly charged (In,Ga)As/GaAs quantum dots can be driven into a single mode of precession about a magnetic field. This regime is achieved by allowing only this single mode within the electron-spin precession spectrum of the ensemble to be synchronized with a train of periodic optical excitation pulses. Under this condition a nuclei-induced frequency focusing leads to a shift of almost all spin precession frequencies into the synchronized mode. The macroscopic magnetic moment of the electron spins that is created in this regime precesses free of dephasing induced by inhomogeneous distribution of g factors.

引用

页数：4

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