Journal
NATURE COMMUNICATIONS
Volume 10, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-09995-0
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Funding
- National Basic Research Program of China from the MOST [2016YFA0300600, 2015CB921101]
- NSFC [11527806, 11874406]
- Singapore National Research Foundation under NRF award [NRF-RF2013-08]
- MOE Tier 2 [MOE2016-T2-2-153, MOE2015-T2-2-007]
- A*Star QTE program
- JST-ACCEL
- JSPS KAKENHI [JP16H06333, P16382]
- Hong Kong Research Grants Council [ECS26302118]
- Croucher Foundation
- HKRGC [C6026-16W, 16309718, 16307117, 16324216]
- Science, Technology, and Innovation Commission of Shenzhen Municipality [ZDSYS20170303165926217]
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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 1T(d) 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 1T(d) 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.
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