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Spin–valley locking in the normal state of a transition-metal dichalcogenide superconductor
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Bawden, L., Cooil, S. P., Mazzola, F., Riley, J. M., Collins-McIntyre, L. J., Sunko, V., Hunvik, K. W. B., Leandersson, M., Polley, C. M., Balasubramanian, T., Kim, T. K., Hoesch, M., Wells, J. W., Balakrishnan, Geetha, Bahramy, M. S. and King, P. D. C. (2016) Spin–valley locking in the normal state of a transition-metal dichalcogenide superconductor. Nature Communications, 7 . p. 11711. doi:10.1038/ncomms11711 ISSN 2041-1723.
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Official URL: http://dx.doi.org/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.
Item Type: | Journal Article | |||||||||||||||||||||||||||||||||
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Subjects: | Q Science > QC Physics | |||||||||||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Superconductors, Fermi surfaces, Superconductivity , Photoemission | |||||||||||||||||||||||||||||||||
Journal or Publication Title: | Nature Communications | |||||||||||||||||||||||||||||||||
Publisher: | Nature Publishing Group | |||||||||||||||||||||||||||||||||
ISSN: | 2041-1723 | |||||||||||||||||||||||||||||||||
Official Date: | 23 May 2016 | |||||||||||||||||||||||||||||||||
Dates: |
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Volume: | 7 | |||||||||||||||||||||||||||||||||
Page Range: | p. 11711 | |||||||||||||||||||||||||||||||||
DOI: | 10.1038/ncomms11711 | |||||||||||||||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||||||||||||||||||||
Date of first compliant deposit: | 24 April 2017 | |||||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 25 April 2017 | |||||||||||||||||||||||||||||||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), International Max Planck partnership (IMPP), Royal Society (Great Britain). University Research Fellowship, Japan. Monbu Kagakushō [Japan. Ministry of Education, Culture, Sports, Science and Technology] (MK), Sweden. Vetenskapsrådet [Research Council], Knut och Alice Wallenbergs Stiftelse (Sweden) | |||||||||||||||||||||||||||||||||
Grant number: | EP/I031014/1, EP/M028771/1, EP/G03673X/1, EP/L505079/1, EP/L015110/1 (EPSRC), 24224009 (MK) | |||||||||||||||||||||||||||||||||
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