Charge metastability and hysteresis in the quantum Hall regime
Charge metastability and hysteresis in the quantum Hall regime
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DOI：
10.1103/physrevb.94.245440
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发表时间：
2016-12-29
影响因子：
3.7
通讯作者：
West, K. W.
中科院分区：
文献类型：
--
作者：
Pollanen, J.;Eisenstein, J. P.;West, K. W.
本文报道了GaAs双层二维电子系统的准直流磁输运和高频声表面波的同步测量。在强整数量子化霍尔态附近，在低温下观察到声波速度的强磁场扫描滞后。这种滞后表明样品内部存在具有异常高电导率的亚稳态。这种非平衡状态是没有透露由传统的低频传输测量，这是占主导地位的无耗散运输的边缘的二维系统。我们发现，场冷却技术允许平衡的电荷配置内的内部的样品被建立。一个简单的模型，这种行为进行了讨论。
We report simultaneous quasi-dc magnetotransport and high-frequency surface acoustic wave measurements on bilayer two-dimensional electron systems in GaAs. Near strong integer quantized Hall states, a strong magnetic-field-sweep hysteresis in the velocity of the acoustic waves is observed at low temperatures. This hysteresis indicates the presence of a metastable state with anomalously high conductivity in the interior of the sample. This nonequilibrium state is not revealed by conventional low-frequency transport measurements which are dominated by dissipationless transport at the edge of the two-dimensional system. We find that a field-cooling technique allows the equilibrium charge configuration within the interior of the sample to be established. A simple model for this behavior is discussed.