Signatures of an anomalous Nernst effect in a mesoscopic two-dimensional electron system
Signatures of an anomalous Nernst effect in a mesoscopic two-dimensional electron system
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介观二维电子系统中反常能斯特效应的特征
DOI：
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发表时间：
2010
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通讯作者：
A. Ghosh
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作者：
S. Goswami;C. Siegert;M. Pepper;I. Farrer;D. Ritchie;A. Ghosh
在朗道能级量子化开始之前，我们研究了低磁场下介观二维电子系统(2DES)中的能斯特效应。能斯特信号的总体强度与半经典预测很好地吻合。我们观察到信号中可重复的介观波动，这种波动随着温度的升高而显着减弱。我们还发现能斯特效应表现出一个与振荡霍尔效应相关的反常分量。这一行为可能能够区分2DES中不同的自旋相关状态。
We investigate the Nernst effect in a mesoscopic two-dimensional electron system (2DES) at low magnetic fields, before the onset of Landau level quantization. The overall magnitude of the Nernst signal agrees well with semiclassical predictions. We observe reproducible mesoscopic fluctuations in the signal that diminish significantly with an increase in temperature. We also show that the Nernst effect exhibits an anomalous component that is correlated with an oscillatory Hall effect. This behavior may be able to distinguish between different spin-correlated states in the 2DES.