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arXiv 0802.2219cond-mat.mes-hall
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量子霍尔区边缘态的噪声退相

Noise dephasing in the edge states of the Integer Quantum Hall regime

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

摘要:

在填充因子为2的整数量子霍尔机制中,使用电子马赫-曾德尔干涉仪来研究干涉的退相。这被发现是由存在于彼此电容耦合的边缘态中的电噪声引起的。在一个通道中产生的电散粒噪声导致另一个通道中的相位随机化,这破坏了干涉图案。这些发现扩展到失相引起的热噪声,而不是散粒噪声:它解释了基本机制负责有限的温度相干时间$τ_ϕ(T)$的边缘状态在填充因子2,在最近的实验中测量。最后,我们在这里提出了一个理论的基础上的高斯噪声,这是发现在很好的协议与我们的实验结果。

英文摘要:

An electronic Mach Zehnder interferometer is used in the integer quantum hall regime at filling factor 2, to study the dephasing of the interferences. This is found to be induced by the electrical noise existing in the edge states capacitively coupled to each others. Electrical shot noise created in one channel leads to phase randomization in the other, which destroys the interference pattern. These findings are extended to the dephasing induced by thermal noise instead of shot noise: it explains the underlying mechanism responsible for the finite temperature coherence time $τ_ϕ(T)$ of the edge states at filling factor 2, measured in a recent experiment. Finally, we present here a theory of the dephasing based on Gaussian noise, which is found in excellent agreement with our experimental results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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