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Superconducting Interfaces between Weyl Semimetal and Normal Metal
Author(s) -
Zhu Wenliang,
Wang Yiyan,
Li Jing,
Huang Yifei,
Dong Qingxin,
Hou Xingyuan,
Zhao Lingxiao,
Zhang Shuai,
Yang Huaixin,
Ren Zhian,
Shan Lei,
Chen Genfu
Publication year - 2020
Publication title -
advanced quantum technologies
Language(s) - English
Resource type - Journals
ISSN - 2511-9044
DOI - 10.1002/qute.202000020
Subject(s) - superconductivity , weyl semimetal , semimetal , condensed matter physics , point reflection , pairing , physics , doping , electronic structure , topology (electrical circuits) , materials science , band gap , mathematics , combinatorics
Interfaces between materials with different crystal structures and electronic properties offer an approach for creating and controlling novel quantum states of matter, in which inversion symmetry breaking and other effects at the boundaries may introduce additional electronic states. Here the observation of superconductivity at ≈3 K at the interface of the Weyl semimetal TaAs and the normal metal Ag is reported, as evidenced by soft‐point‐contact spectroscopy and the standard four‐probe resistance measurements. This is different from the previous reports on interface superconductivity based on the materials that are known to be superconducting in bulk; here both TaAs and Ag are not superconducting even via chemical doping or application of high pressure. The topologically nontrivial band structure of TaAs is considered to play a crucial role in this system and an unconventional Cooper pairing would be expected. This finding opens up a new route for the realization and study of the possible topological superconductivity.