Anomalous proximity effect of planar topological Josephson junctions
Anomalous proximity effect of planar topological Josephson junctions
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DOI：
10.1103/physrevb.102.140505
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发表时间：
2020-10-29
影响因子：
3.7
通讯作者：
Tanaka, Y.
中科院分区：
文献类型：
--
作者：
Ikegaya, S.;Tamura, S.;Tanaka, Y.
脏超导结中的异常邻近效应是最引人注目的现象之一，凸显了拓扑超导体中马约拉纳束缚态和奇数频率库珀对的深刻本质。受最近平面拓扑约瑟夫森结实验实现的启发，我们描述了超导体/半导体混合体中的异常邻近效应，其中一个额外的脏普通金属段从拓扑约瑟夫森结延伸出来。拓扑约瑟夫森结中的拓扑相变伴随着所附着的脏普通金属的低能传输特性的急剧变化。零偏置微分电导的量子化仅出现在拓扑非平凡相中，是由马约拉纳束缚态和奇数频率库珀对渗透到肮脏的正常金属段中引起的。因此，我们提出了一个观察异常邻近效应的实用实验。
The anomalous proximity effect in dirty superconducting junctions is one of most striking phenomena highlighting the profound nature of Majorana bound states and odd-frequency Cooper pairs in topological superconductors. Motivated by the recent experimental realization of planar topological Josephson junctions, we describe the anomalous proximity effect in a superconductor/semiconductor hybrid, where an additional dirty normal-metal segment is extended from a topological Josephson junction. The topological phase transition in the topological Josephson junction is accompanied by a drastic change in the low-energy transport properties of the attached dirty normal metal. The quantization of the zero-bias differential conductance, which appears only in the topologically nontrivial phase, is caused by the penetration of the Majorana bound states and odd-frequency Cooper pairs into a dirty normal-metal segment. As a consequence, we propose a practical experiment for observing the anomalous proximity effect.