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arXiv 1012.4227cond-mat.mes-hall
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量子霍尔效应击穿引起的动态核自旋极化的空间梯度

Spatial gradient of dynamic nuclear spin polarization induced by breakdown of quantum Hall effect

Minoru Kawamura, Kimitoshi Kono, Yoshiaki Hashimoto, Shingo Katsumoto, Tomoki Machida

摘要:

研究了霍尔栅器件中量子霍尔效应击穿区动态核极化的空间分布。我们检测核磁共振(NMR)信号的极化核自旋通过测量霍尔电压$V_{xy}$使用三对电压探针连接到霍尔条的导电通道。我们发现,NMR信号的幅度取决于霍尔电压探针的位置,并且最大的NMR信号从离电子注入电极最远的探针对获得。结合抽运-探测实验结果,我们得出QHE击穿引起的DNP沿电子漂移方向发展的结论。

英文摘要:

We studied spatial distribution of dynamic nuclear polarization (DNP) in a Hall-bar device in a breakdown regime of the quantum Hall effect (QHE). We detected nuclear magnetic resonance (NMR) signals from the polarized nuclear spins by measuring the Hall voltage $V_{xy}$ using three pairs of voltage probes attached to the conducting channel of the Hall bar. We find that the amplitude of the NMR signal depends on the position of the Hall voltage probes and that the largest NMR signal is obtained from the pair of probes farthest from the electron-injecting electrode. Combined with results on pump-and-probe measurements, we conclude that the DNP induced by QHE breakdown develops along the electron-drift direction.

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