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arXiv 1803.00352cond-mat.mes-hallquant-ph
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量子干涉对n-GaAs中电子自旋动力学的控制

Quantum Interference Controls the Electron Spin Dynamics in n-GaAs

V. V. Belykh, A. Yu. Kuntsevich, M. M. Glazov, K. V. Kavokin, D. R. Yakovlev, M. Bayer

摘要:

量子干涉效应在宏观物体中的表现是罕见的。弱定域化是这种效应在电子输运通过固态时出现的少数例子之一。在这里,我们表明,弱本地化变得突出,也在光学光谱通过检测的电子自旋动力学。特别是,我们发现,弱本地化控制在低温和弱磁场下的半导体中的自由电子自旋弛豫,通过减慢它的几乎两个因素在$n$掺杂GaAs的金属相。弱局域化效应对自旋弛豫的影响被约1 T的中等磁场抑制,这破坏了电子轨迹的干扰,并通过提高温度。弱的局域化抑制导致纵向电子自旋弛豫时间$T_1$随磁场的异常减小,与众所周知的磁场诱导的$T_1$的增加形成鲜明对比。这与显示电阻率随磁场的相同变化的传输测量是一致的。我们的发现为探索自旋动力学中的量子磁输运效应开辟了广阔的天地。

英文摘要:

Manifestations of quantum interference effects in macroscopic objects are rare. Weak localization is one of the few examples of such effects showing up in the electron transport through solid state. Here we show that weak localization becomes prominent also in optical spectroscopy via detection of the electron spin dynamics. In particular, we find that weak localization controls the free electron spin relaxation in semiconductors at low temperatures and weak magnetic fields by slowing it down by almost a factor of two in $n$-doped GaAs in the metallic phase. The weak localization effect on the spin relaxation is suppressed by moderate magnetic fields of about 1 T, which destroy the interference of electron trajectories, and by increasing the temperature. The weak localization suppression causes an anomalous decrease of the longitudinal electron spin relaxation time $T_1$ with magnetic field, in stark contrast with well-known magnetic field induced increase in $T_1$. This is consistent with transport measurements which show the same variation of resistivity with magnetic field. Our discovery opens a vast playground to explore quantum magneto-transport effects optically in the spin dynamics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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