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arXiv 0907.0272cond-mat.mes-hall
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Rashba环中Aharonov-Casher相位对Josephson电流的控制

Control of Josephson current by Aharonov-Casher Phase in a Rashba Ring

Xin Liu, M. F. Borunda, Xiong-Jun Liu, Jairo Sinova

摘要:

本文研究了Aharonov-Casher相位对通过超导引线半导体环的约瑟夫森电流的干涉效应。使用一维模型,结合自旋轨道耦合的半导体环,我们计算的Andreev水平解析和数值,并预测振荡的约瑟夫森电流由于AC相位。该结果从点接触极限到长沟道长度极限是有效的,如由结长度和BCS愈合长度的比率所定义的。我们表明,在长的沟道长度限制的杂质散射的约瑟夫森电流的振荡没有影响,相反的情况下的电导率振荡的自旋轨道耦合环系统连接到正常的引线,杂质散射降低了振荡的振幅。我们的研究结果提出了一种新的方案来测量交流相位,在原则上,更高的灵敏度。此外,该效应允许控制通过栅极电压调谐的AC相的约瑟夫森电流。

英文摘要:

We study the interference effect induced by the Aharonov-Casher phase on the Josephson current through a semiconducting ring attached to superconducting leads. Using a 1D model that incorporates spin-orbit coupling in the semiconducting ring, we calculate the Andreev levels analytically and numerically, and predict oscillations of the Josephson current due to the AC phase. This result is valid from the point contact limit to the long channel length limit, as defined by the ratio of the junction length and the BCS healing length. We show in the long channel length limit that the impurity scattering has no effect on the oscillation of the Josephson current, in contrast to the case of conductivity oscillations in a spin-orbit coupled ring system attached to normal leads where impurity scattering reduces the amplitude of oscillations. Our results suggest a new scheme to measure the AC phase with, in principle, higher sensitivity. In addition, this effect allows for control of the Josephson current through the gate voltage tuned AC phase.

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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