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arXiv 0710.2806cond-mat.mes-hall
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直接测量量子霍尔体系边缘态的相干长度

Direct measurement of the coherence length of edge states in the Integer Quantum Hall Regime

P. Roulleau, F. Portier, P. Roche, A. Cavanna, G. Faini, U. Gennser, D. Mailly

摘要:

我们确定了量子量子霍尔效应(IQHE)体系中边缘态的有限温度相干长度。这是通过测量不同尺寸的电子马赫-曾德尔干涉仪的可见度来实现的,填充因子为2。可见度随温度呈指数衰减。发现特征温标与干涉仪臂的长度成反比,从而允许定义相干长度$ł_ϕ$。对于所有样本,$ł_ϕ$随磁场的变化是相同的,最大值位于量子霍尔平台的上端。我们的研究结果提供了第一个准确的测定$ł_ϕ$在量子霍尔制度。

英文摘要:

We have determined the finite temperature coherence length of edge states in the Integer Quantum Hall Effect (IQHE) regime. This was realized by measuring the visibility of electronic Mach-Zehnder interferometers of different sizes, at filling factor 2. The visibility shows an exponential decay with the temperature. The characteristic temperature scale is found inversely proportional to the length of the interferometer arm, allowing to define a coherence length $ł_ϕ$. The variations of $ł_ϕ$ with magnetic field are the same for all samples, with a maximum located at the upper end of the quantum hall plateau. Our results provide the first accurate determination of $ł_ϕ$ in the quantum Hall regime.

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