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arXiv 1602.04161cond-mat.mes-hall
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库珀对的Rashba分裂

Rashba splitting of Cooper pairs

R. I. Shekhter, O. Entin-Wohlman, M. Jonson, A. Aharony

摘要:

我们从理论上研究了两个超导导线之间的弱连接的性质,该弱连接具有由电场引起的强Rashba自旋轨道耦合的非超导纳米线的形式。在库仑阻塞制度的单电子隧穿,我们发现,这样一个弱链接作为一个“自旋分裂”的自旋态的库珀对隧道通过链接,在一定程度上取决于电场的方向。我们表明,约瑟夫森电流是敏感的两个传输通道之间的干扰,其中一个是一个库珀对的两个成员的自旋被保存和一个他们都被翻转。因此,电流是自旋-轨道相互作用强度和纳米线弯曲角度(机械弯曲时)的周期函数;由于应变诱导的自旋-轨道耦合,出现了相同的效果。相比之下,没有自旋-轨道诱导的干涉效应可以影响通过连接两个正常金属的单个弱连接的电流。

英文摘要:

We investigate theoretically the properties of a weak link between two superconducting leads, which has the form of a non-superconducting nanowire with a strong Rashba spin-orbit coupling caused by an electric field. In the Coulomb blockade regime of single-electron tunneling, we find that such a weak link acts as a "spin splitter" of the spin states of Cooper pairs tunneling through the link, to an extent that depends on the direction of the electric field. We show that the Josephson current is sensitive to interference between the resulting two transmission channels, one where the spins of both members of a Cooper pair are preserved and one where they are both flipped. As a result, the current is a periodic function of the strength of the spin-orbit interaction and of the bending angle of the nanowire (when mechanically bent); an identical effect appears due to strain-induced spin-orbit coupling. In contrast, no spin-orbit induced interference effect can influence the current through a single weak link connecting two normal metals.

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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