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

DOI: 10.1038/ncomms11711 DOI Help

Authors: L. Bawden (SUPA, School of Physics and Astronomy, University of St Andrews) , S. P. Cooil (Department of Physics, Norwegian University of Science and Technology (NTNU)) , F. Mazzola (Department of Physics, 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 (Department of Physics, 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 (Department of Physics, Norwegian University of Science and Technology (NTNU)) , G. Balakrishnan (Department of Physics, University of Warwick) , M. S. Bahramy (Quantum-Phase Electronics Center and Department of Applied Physics, 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)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Communications , VOL 7 , PAGES 11711

State: Published (Approved)
Published: May 2016
Diamond Proposal Number(s): 11383

Open Access Open Access

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.

Subject Areas: Physics, Materials


Instruments: I05-ARPES

Other Facilities: MAX IV Laboratory