π and 4π Josephson Effects Mediated by a Dirac Semimetal

Physical Review Letters
W YuF Zhang

Abstract

Cd_{3}As_{2} is a three-dimensional topological Dirac semimetal with connected Fermi-arc surface states. It has been suggested that topological superconductivity can be achieved in the nontrivial surface states of topological materials by utilizing the superconductor proximity effect. Here we report observations of both π and 4π periodic supercurrents in aluminum-Cd_{3}As_{2}-aluminum Josephson junctions. The π period is manifested by both the magnetic-field dependence of the critical supercurrent and the appearance of half-integer Shapiro steps in the ac Josephson effect. Our macroscopic theory suggests that the π period arises from interference between the induced bulk superconductivity and the induced Fermi-arc surface superconductivity. The 4π period is manifested by the missing first Shapiro steps and is expected for topological superconductivity.

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Citations

Nov 18, 2018·Physical Review Letters·Qiyue WangFan Zhang
Mar 14, 2020·Scientific Reports·Leonid N OveshnikovBoris A Aronzon
Mar 4, 2020·Nature Communications·Cai-Zhen LiZhi-Min Liao
Jul 9, 2020·Physical Review Letters·Zhongbo YanWen Huang
Dec 15, 2018·Physical Review Letters·Song-Bo ZhangBjörn Trauzettel
Sep 19, 2018·Nature Materials·Chuan LiAlexander Brinkman
Nov 22, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Azin MohajeraniS A Jafari
Sep 19, 2018·Nature Materials·Fan Zhang, Wei Pan
Jan 30, 2021·Physical Review Letters·Cai-Zhen LiZhi-Min Liao
Apr 23, 2021·Scientific Reports·Wei PanTina M Nenoff
Apr 15, 2020·ACS Nano·An-Qi WangZhi-Min Liao

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