Nontrivial superconductivity in topological MoTe2-x S x crystals

Proceedings of the National Academy of Sciences of the United States of America
Yanan LiJian Wang

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 (MoTe2-x S x , 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 MoTe2-x S x 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 MoTe2-x S x is not only a promising topological superconductor candidate but also a unique material for study of s +- superconductivity.

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Citations

Oct 2, 2019·Nanoscale·Lijun MengRudolf A Römer
Jul 31, 2020·Proceedings of the National Academy of Sciences of the United States of America·Fu ZhangMauricio Terrones
Jan 12, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Roman Lucrezi, Christoph Heil
Mar 11, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Mukhtar Lawan Adam, Abba Alhaji Bala
Jun 10, 2020·ACS Applied Materials & Interfaces·Yuzhe YangJin Zou
Apr 3, 2020·ACS Applied Materials & Interfaces·Peng ZhangYongji Gong

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