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

Author

Listed:
  • L. Bawden

    (SUPA, School of Physics and Astronomy, University of St Andrews)

  • S. P. Cooil

    (Norwegian University of Science and Technology (NTNU))

  • F. Mazzola

    (Norwegian University of Science and Technology (NTNU))

  • J. M. Riley

    (SUPA, School of Physics and Astronomy, University of St Andrews
    Diamond Light Source)

  • L. J. Collins-McIntyre

    (SUPA, School of Physics and Astronomy, University of St Andrews)

  • V. Sunko

    (SUPA, School of Physics and Astronomy, University of St Andrews
    Max Planck Institute for Chemical Physics of Solids)

  • K. W. B. Hunvik

    (Norwegian University of Science and Technology (NTNU))

  • M. Leandersson

    (MAX IV Laboratory, Lund University)

  • C. M. Polley

    (MAX IV Laboratory, Lund University)

  • T. Balasubramanian

    (MAX IV Laboratory, Lund University)

  • T. K. Kim

    (Diamond Light Source)

  • M. Hoesch

    (Diamond Light Source)

  • J. W. Wells

    (Norwegian University of Science and Technology (NTNU))

  • G. Balakrishnan

    (University of Warwick)

  • M. S. Bahramy

    (The University of Tokyo
    RIKEN center for Emergent Matter Science (CEMS))

  • P. D. C. King

    (SUPA, School of Physics and Astronomy, University of St Andrews)

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.

Suggested Citation

  • 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., 2016. "Spin–valley locking in the normal state of a transition-metal dichalcogenide superconductor," Nature Communications, Nature, vol. 7(1), pages 1-6, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11711
    DOI: 10.1038/ncomms11711
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    Cited by:

    1. Oliver J. Clark & Oliver Dowinton & Mohammad Saeed Bahramy & Jaime Sánchez-Barriga, 2022. "Hidden spin-orbital texture at the $$\overline{{{\Gamma }}}$$ Γ ¯ -located valence band maximum of a transition metal dichalcogenide semiconductor," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    2. Andrey Polyakov & Katayoon Mohseni & Roberto Felici & Christian Tusche & Ying-Jun Chen & Vitaly Feyer & Jochen Geck & Tobias Ritschel & Arthur Ernst & Juan Rubio-Zuazo & German R. Castro & Holger L. M, 2022. "Fermi surface chirality induced in a TaSe2 monosheet formed by a Ta/Bi2Se3 interface reaction," Nature Communications, Nature, vol. 13(1), pages 1-8, December.

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