Electron spin relaxation by nuclei in semiconductor quantum dots

被引：808
|
作者：
Merkulov, IA [1 ]
Efros, AL
Rosen, M
机构：
[1] Russian Acad Sci, Ioffe Inst, St Petersburg 196140, Russia
[2] USN, Res Lab, Nanostruct Opt Sect, Washington, DC 20375 USA
来源：
PHYSICAL REVIEW B | 2002年 / 65卷 / 20期
关键词：
D O I：
10.1103/PhysRevB.65.205309
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have studied theoretically electron spin relaxation in semiconductor quantum dots via interaction with nuclear spins. The relaxation is shown to be determined by three processes: (i) the precession of the electron spin in the hyperfine field of the frozen fluctuation of the nuclear spins; (ii) the precession of the nuclear spins in the hyperfine field of the electron; and (iii) the precession of the nuclear spin in the dipole field of its nuclear neighbors. In external magnetic fields the relaxation of electron spins directed along the magnetic field is suppressed. Electron spins directed transverse to the magnetic field relax completely in a time on the order of the precession period of its spin in the field of the frozen fluctuation of the nuclear spins. Comparison with experiment shows that the hyperfine interaction with nuclei may be the dominant mechanism of electron spin relaxation in quantum dots.
引用
收藏
页码：2053091 / 2053098
页数：8
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