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

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-TaS 2 and 2H-NbSe 2. 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.

Authors:
ORCiD logo [1];  [1];  [1];  [2];  [3]; ORCiD logo [4];  [4];  [5]; ORCiD logo [6];  [1];  [1]
  1. Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Physics
  2. Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Physics; Cornell Univ., Ithaca, NY (United States). School of Applied and Engineering Physics
  3. Univ. of Washington, Seattle, WA (United States). Dept. of Physics
  4. National Inst. for Materials Science (NIMS), Tsukuba (Japan). Advanced Materials Lab.
  5. Univ. of Waterloo, ON (Canada). Inst. for Quantum Computing and Dept. of Chemistry
  6. Univ. of Washington, Seattle, WA (United States). Dept. of Physics and Dept. of Materials Science and Engineering
Publication Date:
Research Org.:
Univ. of Washington, Seattle, WA (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1523491
Grant/Contract Number:  
SC0012509; SC0018115
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English

Citation Formats

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, and Hunt, Benjamin M. Tuning Ising superconductivity with layer and spin–orbit coupling in two-dimensional transition-metal dichalcogenides. United States: N. p., 2018. Web. doi:10.1038/s41467-018-03888-4.
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. Tuning Ising superconductivity with layer and spin–orbit coupling in two-dimensional transition-metal dichalcogenides. United States. doi:10.1038/s41467-018-03888-4.
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, and Hunt, Benjamin M. Thu . "Tuning Ising superconductivity with layer and spin–orbit coupling in two-dimensional transition-metal dichalcogenides". United States. doi:10.1038/s41467-018-03888-4. https://www.osti.gov/servlets/purl/1523491.
@article{osti_1523491,
title = {Tuning Ising superconductivity with layer and spin–orbit coupling in two-dimensional transition-metal dichalcogenides},
author = {de la Barrera, Sergio C. and Sinko, Michael R. and Gopalan, Devashish P. and Sivadas, Nikhil and Seyler, Kyle L. and Watanabe, Kenji and Taniguchi, Takashi and Tsen, Adam W. and Xu, Xiaodong and Xiao, Di and Hunt, Benjamin M.},
abstractNote = {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.},
doi = {10.1038/s41467-018-03888-4},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {2018},
month = {4}
}

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