Tuning Ising superconductivity with layer and spin–orbit coupling in two-dimensional transition-metal dichalcogenides

Sergio C. Barrera (), Michael R. Sinko, Devashish P. Gopalan, Nikhil Sivadas, Kyle L. Seyler, Kenji Watanabe, Takashi Taniguchi, Adam W. Tsen, Xiaodong Xu, Di Xiao and Benjamin M. Hunt ()
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Sergio C. Barrera: Carnegie Mellon University
Michael R. Sinko: Carnegie Mellon University
Devashish P. Gopalan: Carnegie Mellon University
Nikhil Sivadas: Carnegie Mellon University
Kyle L. Seyler: University of Washington
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
Adam W. Tsen: University of Waterloo
Xiaodong Xu: University of Washington
Di Xiao: Carnegie Mellon University
Benjamin M. Hunt: Carnegie Mellon University

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Systems simultaneously exhibiting superconductivity and spin–orbit coupling are predicted to provide a route toward topological superconductivity and unconventional electron pairing, driving significant contemporary interest in these materials. Monolayer transition-metal dichalcogenide (TMD) superconductors in particular lack inversion symmetry, yielding an antisymmetric form of spin–orbit coupling that admits both spin-singlet and spin-triplet components of the superconducting wavefunction. Here, we present an experimental and theoretical study of two intrinsic TMD superconductors with large spin–orbit coupling in the atomic layer limit, metallic 2H-TaS2 and 2H-NbSe2. We investigate the superconducting properties as the material is reduced to monolayer thickness and show that high-field measurements point to the largest upper critical field thus reported for an intrinsic TMD superconductor. In few-layer samples, we find the enhancement of the upper critical field is sustained by the dominance of spin–orbit coupling over weak interlayer coupling, providing additional candidate systems for supporting unconventional superconducting states in two dimensions.

Date: 2018
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DOI: 10.1038/s41467-018-03888-4

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