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arXiv 1609.01896cond-mat.mes-hall
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量子自旋霍尔约瑟夫森结中的宇称反常和自旋嬗变

Parity anomaly and spin transmutation in quantum spin Hall Josephson junctions

Yang Peng, Yuval Vinkler-Aviv, Piet W. Brouwer, Leonid I. Glazman, Felix von Oppen

摘要:

研究了与局域磁杂质耦合的量子自旋霍尔系统中的约瑟夫森效应。作为费米子宇称异常的结果,当穿过结的超导相位差前进$2π$时,杂质和自旋霍尔边缘的组合系统的自旋在半整数和整数值之间交替。这导致了交换耦合和单离子各向异性在相位差,其中保留时间保留对称性的自旋多重态分裂的特征差异。我们讨论了$8π$周期(或$\mathbb{Z}_4$)的分数约瑟夫森效应的背景下,最近的实验。

英文摘要:

We study the Josephson effect in a quantum spin Hall system coupled to a localized magnetic impurity. As a consequence of the fermion parity anomaly, the spin of the combined system of impurity and spin-Hall edge alternates between half-integer and integer values when the superconducting phase difference across the junction advances by $2π$. This leads to characteristic differences in the splittings of the spin multiplets by exchange coupling and single-ion anisotropy at phase differences, for which time-reserval symmetry is preserved. We discuss the resulting $8π$-periodic (or $\mathbb{Z}_4$) fractional Josephson effect in the context of recent experiments.

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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