Nontrivial superconductivity in topological MoTe2−xSx crystals

Yanan Li, Qiangqiang Gu, Chen Chen, Jun Zhang, Qin Liu, Xiyao Hu, Jun Liu, Yi Liu, Langsheng Ling, Mingliang Tian, Yong Wang, Nitin Samarth, Shiyan Li, Tong Zhang, Ji Feng, Jian Wang

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

Topological Weyl semimetals (TWSs) with pairs of Weyl points and topologically protected Fermi arc states have broadened the classification of topological phases and provide superior platform for study of topological superconductivity. Here we report the nontrivial superconductivity and topological features of sulfur-doped Td-phase MoTe2 with enhanced Tc compared with type-II TWS MoTe2. It is found that Td-phase S-doped MoTe2 (MoTe2xSx, x ∼ 0.2) is a two-band s-wave bulk superconductor (∼0.13 meV and 0.26 meV), where the superconducting behavior can be explained by the s+− pairing model. Further, measurements of the quasi-particle interference (QPI) patterns and a comparison with band-structure calculations reveal the existence of Fermi arcs in MoTe2xSx. More interestingly, a relatively large superconducting gap (∼1.7 meV) is detected by scanning tunneling spectroscopy on the sample surface, showing a hint of topological nontrivial superconductivity based on the pairing of Fermi arc surface states. Our work demonstrates that the Td-phase MoTe2xSx is not only a promising topological superconductor candidate but also a unique material for study of s+− superconductivity.

Original languageEnglish (US)
Pages (from-to)9503-9508
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume115
Issue number38
DOIs
StatePublished - Sep 18 2018

All Science Journal Classification (ASJC) codes

  • General

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