Electron Spin Dephasing due to Hyperfine Interactions with a Nuclear Spin Bath

被引：273
作者：
Cywinski, Lukasz [1 ]
Witzel, Wayne M. [2 ]
Das Sarma, S. [1 ]
机构：
[1] Univ Maryland, Dept Phys, Condensed Matter Theory Ctr, College Pk, MD 20742 USA
[2] USN, Res Lab, Washington, DC 20375 USA
来源：
PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 05期
关键词：
QUANTUM DOTS; DECOHERENCE;
D O I：
10.1103/PhysRevLett.102.057601
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We investigate pure dephasing decoherence (free induction decay and spin echo) of a spin qubit interacting with a nuclear spin bath. While for infinite magnetic field B the only decoherence mechanism is spectral diffusion due to dipolar flip-flops of nuclear spins, with decreasing B the hyperfine-mediated interactions between the nuclear spins become important. We give a theory of decoherence due to these interactions which takes advantage of their long-range nature. For a thermal uncorrelated bath we show that our theory is applicable down to B similar to 10 mT, allowing for comparison with recent experiments in GaAs quantum dots.
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页数：4
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