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arXiv 1808.02809cond-mat.mes-hall
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硅烯中$2π$ -和$4π$ -约瑟夫森效应通过拓扑限制沟道的电控交叉

Electrically controlled crossover between $2π$- and $4π$-Josephson effects through topologically-confined channels in silicene

Daniel Frombach, Sunghun Park, Alexander Schroer, Patrik Recher

摘要:

我们提出了一种可调拓扑约瑟夫森结在硅烯静电门可以切换之间的平凡和拓扑结。这些方面是一个可调的相变的拓扑限制谷手征态从自旋简并到自旋螺旋制度的结果。我们计算Andreev束缚态在这样的结分析使用低能量近似的紧束缚模型的硅烯在接近s波超导体,以及在数值上的短和长结制度,并在存在谷间散射。结合拓扑平凡和非平凡的地区,我们展示了如何谷间散射可以有效地打开和关闭内的约瑟夫森结。这构成了一个拓扑约瑟夫森结与电可调准粒子中毒源。

英文摘要:

We propose a tunable topological Josephson junction in silicene where electrostatic gates could switch between a trivial and a topological junction. These aspects are a consequence of a tunable phase transition of the topologically confined valley-chiral states from a spin-degenerate to a spin-helical regime. We calculate the Andreev bound states in such a junction analytically using a low-energy approximation to the tight-binding model of silicene in proximity to s-wave superconductors as well as numerically in the short- and long-junction regime and in the presence of intervalley scattering. Combining topologically trivial and non-trivial regions, we show how intervalley scattering can be effectively switched on and off within the Josephson junction. This constitutes a topological Josephson junction with an electrically tunable quasiparticle poisoning source.

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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