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arXiv 0705.3179cond-mat.mes-hallcond-mat.stat-mech
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开放量子点电阻涨落的非局域探测

Non-local detection of resistance fluctuations of an open quantum dot

A. I. Lerescu, E. J. Koop, C. H. van der Wal, B. J. van Wees, J. H. Bardarson

摘要:

研究了通过量子点接触与四个储层相连的开放量子点的非局域电阻的量子涨落。在这种四端量子点中,电压路径和电流路径可以分离,我们测量了几百欧姆的非局域电阻波动,它是偏置电压、栅电压和垂直磁场的函数。当电压探针和点之间的耦合增强时,电阻波动的幅度大大减小。随着实验结果,我们提出了基于Landauer-Büttiker形式主义的理论分析。虽然理论预测的非本地电阻波动的幅度比已经观察到的要大得多,协议与理论是非常好的,如果一个额外的退相机制是假设。

英文摘要:

We investigate quantum fluctuations in the non-local resistance of an open quantum dot which is connected to four reservoirs via quantum point contacts. In this four-terminal quantum dot the voltage path can be separated from the current path. We measured non-local resistance fluctuations of several hundreds of Ohms, which have been characterized as a function of bias voltage, gate voltage and perpendicular magnetic field. The amplitude of the resistance fluctuations is strongly reduced when the coupling between the voltage probes and the dot is enhanced. Along with experimental results, we present a theoretical analysis based on the Landauer-Büttiker formalism. While the theory predicts non-local resistance fluctuations of considerably larger amplitude than what has been observed, agreement with theory is very good if an additional dephasing mechanism is assumed.

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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