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arXiv 0910.2683cond-mat.mes-hall
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量子霍尔区的非平衡边沟道光谱

Non-Equilibrium Edge Channel Spectroscopy in the Integer Quantum Hall Regime

C. Altimiras, H. le Sueur, U. Gennser, A. Cavanna, D. Mailly, F. Pierre

摘要:

在介观体系中,热输运具有揭示新物理的巨大潜力。一个引人注目的例子是整数量子霍尔机制,其中霍尔电流的鲁棒性限制了从电荷传输获得的信息。因此,对无间隙边缘激励的理解并不完全。有效边缘态理论将它们描述为一维手征费米子的原型--这是一个简单的图景,可以解释大量的观测结果,并要求在分束器的作用下进行量子点接触的量子信息实验。然而,这是在表面上的分歧与流行的理论框架,预测,在大多数情况下,额外的无间隙边缘模式。在这里,我们提出了一个设置,它提供了访问的能量分布,并因此到能量流,在边缘通道带出平衡。这提供了一个严格的测试是否额外的状态捕获部分注入的能量。我们的研究结果表明,这是不是这样的情况下,从而证明关于能量传输,量子点接触和分束器的量子光学类比。除了量子霍尔制度,这种新的光谱技术打开了一个新的窗口,热传输和平衡实验。

英文摘要:

Heat transport has large potentialities to unveil new physics in mesoscopic systems. A striking illustration is the integer quantum Hall regime, where the robustness of Hall currents limits information accessible from charge transport. Consequently, the gapless edge excitations are incompletely understood. The effective edge states theory describes them as prototypal one-dimensional chiral fermions - a simple picture that explains a large body of observations and calls for quantum information experiments with quantum point contacts in the role of beam splitters. However, it is in ostensible disagreement with the prevailing theoretical framework that predicts, in most situations, additional gapless edge modes. Here, we present a setup which gives access to the energy distribution, and consequently to the energy current, in an edge channel brought out-of-equilibrium. This provides a stringent test of whether the additional states capture part of the injected energy. Our results show it is not the case and thereby demonstrate regarding energy transport, the quantum optics analogy of quantum point contacts and beam splitters. Beyond the quantum Hall regime, this novel spectroscopy technique opens a new window for heat transport and out-of-equilibrium experiments.

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