Temperature dependence of dynamic nuclear polarization and its effect on electron spin relaxation and dephasing in InAs/GaAs quantum dots
Temperature dependence of dynamic nuclear polarization and its effect on electron spin relaxation and dephasing in InAs/GaAs quantum dots
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InAs/GaAs 量子点中动态核极化的温度依赖性及其对电子自旋弛豫和相移的影响
DOI：
10.1063/1.3701273
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发表时间：
2012
影响因子：
4
通讯作者：
Weimin M. Chen
中科院分区：
文献类型：
--
作者：
J. Beyer;Y. Puttisong;I. Buyanova;S. Suraprapapich;C. Tu;Weimin M. Chen
在InAs/GaAs量子点系综中，研究了在外加纵向磁场下，电子自旋与核自旋的超精细相互作用引起的退相和弛豫随温度的变化.超精细引起的退相的程度被发现减少，而动态核极化随温度的升高而增加。我们将这两种效应归因于通过超精细相互作用驱动的声子辅助电子-核自旋触发器加速电子自旋弛豫，这可能成为高温下电子自旋去极化的主要贡献。
Electron spin dephasing and relaxation due to hyperfine interaction with nuclear spins is studied in an InAs/GaAs quantum dot ensemble as a function of temperature up to 85 K, in an applied longitudinal magnetic field. The extent of hyperfine-induced dephasing is found to decrease, whereas dynamic nuclear polarization increases with increasing temperature. We attribute both effects to an accelerating electron spin relaxation through phonon-assisted electron-nuclear spin flip-flops driven by hyperfine interactions, which could become the dominating contribution to electron spin depolarization at high temperatures.
影响因子：
56.9
作者：
Petta, JR;Johnson, AC;Gossard, AC
通讯作者：
Gossard, AC