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

de la Barrera, Sergio C.; Sinko, Michael R.; Gopalan, Devashish P.; Sivadas, Nikhil; Seyler, Kyle L.; Watanabe, Kenji; Taniguchi, Takashi; Tsen, Adam W.; Xu, Xiaodong; Xiao, Di; Hunt, Benjamin M.

doi:10.1038/s41467-018-03888-4

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

Journal Article · Thu Apr 12 00:00:00 EDT 2018 · Nature Communications

DOI:https://doi.org/10.1038/s41467-018-03888-4· OSTI ID:1523491

^[1]; Sinko, Michael R. ^[1]; Gopalan, Devashish P. ^[1]; Sivadas, Nikhil ^[2]; Seyler, Kyle L. ^[3];

^[4]; Taniguchi, Takashi ^[4]; Tsen, Adam W. ^[5];

^[6]; Xiao, Di ^[1]; Hunt, Benjamin M. ^[1]

Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Physics
Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Physics; Cornell Univ., Ithaca, NY (United States). School of Applied and Engineering Physics
Univ. of Washington, Seattle, WA (United States). Dept. of Physics
National Inst. for Materials Science (NIMS), Tsukuba (Japan). Advanced Materials Lab.
Univ. of Waterloo, ON (Canada). Inst. for Quantum Computing and Dept. of Chemistry
Univ. of Washington, Seattle, WA (United States). Dept. of Physics and Dept. of Materials Science and Engineering

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.

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Research Organization:: Univ. of Washington, Seattle, WA (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0012509; SC0018115

OSTI ID:: 1523491

Journal Information:: Nature Communications, Vol. 9, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 196 works

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