文献类型：期刊文献

英文题名：Critical current anomaly at the topological quantum phase transition in a Majorana Josephson junction

作者：Huang, Hong[1];Liang, Qi-Feng[2];Yao, Dao-Xin[1];Wang, Zhi[1]

机构：[1]Sun Yat Sen Univ, Sch Phys, Guangzhou 510275, Guangdong, Peoples R China;[2]Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China

年份：2017

卷号：381

期号：24

起止页码：2033

外文期刊名：PHYSICS LETTERS A

收录：SCI-EXPANDED(收录号：WOS:000401396000010)、、EI(收录号：20200153457)、Scopus(收录号：2-s2.0-85018740852)、WOS

基金：This work is supported by NSFC-11304400, NSFC-61471401, and SRFDP-20130171120015. Q.F.L is supported by NSFC-11574215. D.X.Y. is supported by NSFC-11074310, NSFC-11275279, SRFDP-20110171110026, and NBRPC-2012CB821400.

语种：英文

外文关键词：Majorana bound states; Critical current; Topological quantum phase transition; Topological superconductors; Josephson effect

外文摘要：Majorana bound states in topological Josephson junctions induce a 4 pi period current-phase relation. Direct detection of the 4 pi periodicity is complicated by the quasiparticle poisoning. We reveal that Majorana bound states are also signaled by the anomalous enhancement on the critical current of the junction. We show the landscape of the critical current for a nanowire Josephson junction under a varying Zeeman field, and reveal a sharp step feature at the topological quantum phase transition point, which comes from the anomalous enhancement of the critical current at the topological regime. In multi-band wires, the anomalous enhancement disappears for an even number of bands, where the Majorana bound states fuse into Andreev bound states. This anomalous critical current enhancement directly signals the existence of the Majorana bound states, and also provides a valid signature for the topological quantum phase transition. (C) 2017 Elsevier B.V. All rights reserved.