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Bawden L, Cooil SP, Mazzola F, et al. Spin-valley locking in the normal state of a transition-metal dichalcogenide superconductor. Nat Commun. 2016;7:11711doi: 10.1038/ncomms11711.
Bawden, L., Cooil, S. P., Mazzola, F., Riley, J. M., Collins-McIntyre, L. J., Sunko, V., Hunvik, K. W., Leandersson, M., Polley, C. M., Balasubramanian, T., Kim, T. K., Hoesch, M., Wells, J. W., Balakrishnan, G., Bahramy, M. S., & King, P. D. (2016). Spin-valley locking in the normal state of a transition-metal dichalcogenide superconductor. Nature communications, 711711. https://doi.org/10.1038/ncomms11711
Bawden, L, et al. "Spin-valley locking in the normal state of a transition-metal dichalcogenide superconductor." Nature communications vol. 7 (2016): 11711. doi: https://doi.org/10.1038/ncomms11711
Bawden L, Cooil SP, Mazzola F, Riley JM, Collins-McIntyre LJ, Sunko V, Hunvik KW, Leandersson M, Polley CM, Balasubramanian T, Kim TK, Hoesch M, Wells JW, Balakrishnan G, Bahramy MS, King PD. Spin-valley locking in the normal state of a transition-metal dichalcogenide superconductor. Nat Commun. 2016 May 23;7:11711. doi: 10.1038/ncomms11711. PMID: 27210515; PMCID: PMC4879244.
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Nat Commun. 2016 May 23;7:11711. doi: 10.1038/ncomms11711.

Spin-valley locking in the normal state of a transition-metal dichalcogenide superconductor.

Nature communications

L Bawden, S P Cooil, F Mazzola, J M Riley, L J Collins-McIntyre, V Sunko, K W B Hunvik, M Leandersson, C M Polley, T Balasubramanian, T K Kim, M Hoesch, J W Wells, G Balakrishnan, M S Bahramy, P D C King

Affiliations

  1. SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, Fife KY16 9SS, UK.
  2. Department of Physics, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway.
  3. Diamond Light Source, Harwell Campus, Didcot, OX11 0DE, UK.
  4. Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01217 Dresden, Germany.
  5. MAX IV Laboratory, Lund University, PO Box 118, 221 00 Lund, Sweden.
  6. Department of Physics, University of Warwick, Coventry CV4 7AL, UK.
  7. Quantum-Phase Electronics Center and Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan.
  8. RIKEN center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.

PMID: 27210515 PMCID: PMC4879244 DOI: 10.1038/ncomms11711

Abstract

Metallic transition-metal dichalcogenides (TMDCs) are benchmark systems for studying and controlling intertwined electronic orders in solids, with superconductivity developing from a charge-density wave state. The interplay between such phases is thought to play a critical role in the unconventional superconductivity of cuprates, Fe-based and heavy-fermion systems, yet even for the more moderately-correlated TMDCs, their nature and origins have proved controversial. Here, we study a prototypical example, 2H-NbSe2, by spin- and angle-resolved photoemission and first-principles theory. We find that the normal state, from which its hallmark collective phases emerge, is characterized by quasiparticles whose spin is locked to their valley pseudospin. This results from a combination of strong spin-orbit interactions and local inversion symmetry breaking, while interlayer coupling further drives a rich three-dimensional momentum dependence of the underlying Fermi-surface spin texture. These findings necessitate a re-investigation of the nature of charge order and superconducting pairing in NbSe2 and related TMDCs.

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