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arXiv 2302.08828cond-mat.supr-con
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Kitaev 梯状超导体之间的 Josephson 效应

Josephson effects between the Kitaev ladder superconductors

Osamu Kanehira, Hiroki Tsuchiura

AI总结:

本文理论研究两个 Kitaev 双腿梯状超导体间的 Josephson 效应,通过数值对角化分析相位与横向跃迁的影响,发现结可呈现分数 Josephson 效应及 0-结、$π$-结行为。

摘要:

由 Kitaev 链构成的双腿梯状系统已知会表现出比单链更丰富的相图。我们从理论上研究了这些梯状系统之间多种多样的 Josephson 效应。我们同时考虑两个梯状系统之间的 Josephson 相位差 $θ$,以及每个梯状系统内部平行链之间的相位差 $ϕ$。在 $T=0$ 时,结的总能量通过数值对角化方法计算,并表示为 $θ$、$ϕ$ 以及梯中横向跃迁 $t_{\perp}$ 的函数。我们发现,通过控制 $t_{\perp}$ 和 $ϕ$,该结不仅对相位差 $θ$ 表现出分数 Josephson 效应,还表现出通常的 0-结乃至 $π$-结性质。

英文摘要:

The two-leg ladder system consisting of the Kitaev chains is known to exhibit a richer phase diagram than that of the single chain. We theoretically investigate the variety of the Josephson effects between the ladder systems. We consider the Josephson phase difference $θ$ between these two ladder systems as well as the phase difference $ϕ$ between the parallel chains in each ladder system. The total energy of the junction at $T = 0$ is calculated by a numerical diagonalization method as functions of $θ$, $ϕ$, and also a transverse hopping $t_{\perp}$ in the ladders. We find that, by controlling $t_{\perp}$ and $ϕ$, the junction exhibits not only the fractional Josephson effect for the phase difference $θ$, but also the usual 0-junction and even $π$-junction properties.

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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