Transport evidence of asymmetric spin–orbit coupling in few-layer superconducting 1Td-MoTe2

Jian Cui, Peiling Li, Jiadong Zhou, Wen-Yu He, Xiangwei Huang, Jian Yi, Jie Fan, Zhongqing Ji, Xiunian Jing, Fanming Qu, Zhi Gang Cheng, Changli Yang, Li Lu, Kazu Suenaga, Junwei Liu, Kam Tuen Law, Junhao Lin (), Zheng Liu () and Guangtong Liu ()
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Jian Cui: Chinese Academy of Sciences
Peiling Li: Chinese Academy of Sciences
Jiadong Zhou: Nanyang Technological University
Wen-Yu He: Hong Kong University of Science and Technology
Xiangwei Huang: Chinese Academy of Sciences
Jian Yi: Chinese Academy of Sciences
Jie Fan: Chinese Academy of Sciences
Zhongqing Ji: Chinese Academy of Sciences
Xiunian Jing: Chinese Academy of Sciences
Fanming Qu: Chinese Academy of Sciences
Zhi Gang Cheng: Chinese Academy of Sciences
Changli Yang: Chinese Academy of Sciences
Li Lu: Chinese Academy of Sciences
Kazu Suenaga: National Institute of Advanced Industrial Science and Technology (AIST)
Junwei Liu: Hong Kong University of Science and Technology
Kam Tuen Law: Hong Kong University of Science and Technology
Junhao Lin: Southern University of Science and Technology
Zheng Liu: Nanyang Technological University
Guangtong Liu: Chinese Academy of Sciences

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Two-dimensional transition metal dichalcogenides MX2 (M = W, Mo, Nb, and X = Te, Se, S) with strong spin–orbit coupling possess plenty of novel physics including superconductivity. Due to the Ising spin–orbit coupling, monolayer NbSe2 and gated MoS2 of 2H structure can realize the Ising superconductivity, which manifests itself with in-plane upper critical field far exceeding Pauli paramagnetic limit. Surprisingly, we find that a few-layer 1Td structure MoTe2 also exhibits an in-plane upper critical field which goes beyond the Pauli paramagnetic limit. Importantly, the in-plane upper critical field shows an emergent two-fold symmetry which is different from the isotropic in-plane upper critical field in 2H transition metal dichalcogenides. We show that this is a result of an asymmetric spin–orbit coupling in 1Td transition metal dichalcogenides. Our work provides transport evidence of a new type of asymmetric spin–orbit coupling in transition metal dichalcogenides which may give rise to novel superconducting and spin transport properties.

Date: 2019
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DOI: 10.1038/s41467-019-09995-0

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