Long-lived electron spin coherence in CdSe/Zn(S,Se) self-assembled quantum dots

被引：36
|
作者：
Syperek, M. [1 ,2 ]
Yakovlev, D. R. [1 ,3 ]
Yugova, I. A. [1 ,4 ]
Misiewicz, J. [2 ]
Sedova, I. V. [3 ]
Sorokin, S. V. [3 ]
Toropov, A. A. [3 ]
Ivanov, S. V. [3 ]
Bayer, M. [1 ]
机构：
[1] Tech Univ Dortmund, D-44221 Dortmund, Germany
[2] Wroclaw Univ Technol, Inst Phys, PL-50370 Wroclaw, Poland
[3] Russian Acad Sci, Ioffe Phys Tech Inst, St Petersburg 194021, Russia
[4] St Petersburg State Univ, Fac Phys, St Petersburg 198504, Russia
来源：
PHYSICAL REVIEW B | 2011年 / 84卷 / 08期
基金：
俄罗斯基础研究基金会;
关键词：
EXCITONS;
D O I：
10.1103/PhysRevB.84.085304
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The electron spin coherence in n-doped and undoped, self-assembled CdSe/Zn(S,Se) quantum dots has been studied by time-resolved pump-probe Kerr rotation. Long-lived spin coherence persisting up to 13 ns after spin orientation has been found in the n-doped quantum dots, outlasting significantly the lifetimes of charge neutral and negatively charged excitons of 350-530 ps. The electron spin dephasing time as long as 5.6 ns has been measured in a magnetic field of 0.25 T. Hyperfine interaction of resident electrons with nuclear spin fluctuations is suggested as the main limiting factor for the dephasing time. The efficiency of this mechanism in II-VI and III-V quantum dots is analyzed.
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页数：8
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