Stable and unstable dynamics of Overhauser fields in a double quantum dot

Sonia Sharmin; Koji Muraki; Toshimasa Fujisawa

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Stable and unstable dynamics of Overhauser fields in a double quantum dot

机译：双量子点中Overhauser场的稳定和不稳定动力学

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Nonlinear dynamics of nuclear spin ensembles driven by a two-electron system in a double quantum dot in the Pauli spin blockade (SB) regime is studied experimentally in conjunction with numerical simulation. Dynamic nuclear spin polarization (DNP) is systematically studied by evaluating the current level and its fluctuations. We interpret large current noise in the SB regime as stable feedback noise, where identical Overhauser fields of the two dots are preferred. In contrast, stepwise increases of current in the shallow Coulomb blockade region can be understood as unstable dynamics with significant imbalance of the Overhauser fields, which cancels the external magnetic field in one of the two dots. There, an extremely small transverse Overhauser field can easily lift the SB transport, giving the highest current level, when longitudinal components cancel the applied field.

机译：结合数值模拟，通过实验研究了在Pauli自旋封锁（SB）体制下双电子点中双电子系统驱动的核自旋集合体的非线性动力学。通过评估电流水平及其波动，系统地研究了动态核自旋极化（DNP）。我们将SB模式中的大电流噪声解释为稳定的反馈噪声，其中两个点的相同Overhauser场是首选。相比之下，浅的库仑阻塞区域中电流的逐步增加可以理解为不稳定的动力学，其中Overhauser场明显不平衡，这抵消了两个点之一中的外部磁场。在那里，当纵向分量抵消施加的磁场时，极小的横向Overhauser磁场可以轻松提升SB运输，从而提供最高的电流水平。

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来源
《Physical review》 |2014年第11期|115315.1-115315.10|共10页
作者
Sonia Sharmin; Koji Muraki; Toshimasa Fujisawa;
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作者单位

Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan;

NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan;

Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan;

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正文语种 eng
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关键词
quantum dots; quantum dots;

机译：量子点;量子点;

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Stable and unstable dynamics of Overhauser fields in a double quantum dot

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