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

Thiagarajan, Balasubramanian LU ; Bawden, L; Cooil, S. P; Mazzola, F; Collins-McIntyre, L. J; Sunko, V; Hunvik, K. W. E; Leandersson, Mats LU ; Polley, Craig LU and Kim, T. M, et al. (2016) In Nature Communications 7.
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... (More)
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. (Less)
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Nature Communications
volume
7
publisher
Nature Publishing Group
external identifiers
  • scopus:84971281688
  • wos:000376205300001
ISSN
2041-1723
DOI
10.1038/ncomms11711
language
English
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yes
id
101100b4-14cc-45e1-8aa3-80b11a1549c9
date added to LUP
2016-11-15 14:11:41
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2017-10-01 05:25:53
@article{101100b4-14cc-45e1-8aa3-80b11a1549c9,
  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.},
  articleno    = {11711},
  author       = {Thiagarajan, Balasubramanian and Bawden, L and Cooil, S. P and Mazzola, F and Collins-McIntyre, L. J and Sunko, V and Hunvik, K. W. E and Leandersson, Mats and Polley, Craig and Kim, T. M and Hoesch, M and Wells, J. W. and Balakrishnan, G and Bahramy, M. S and King, P. D. C and Riley, J. M.},
  issn         = {2041-1723},
  language     = {eng},
  publisher    = {Nature Publishing Group},
  series       = {Nature Communications},
  title        = {Spin-valley locking in the normal state of a transition-metal dichacogenide superconductor},
  url          = {http://dx.doi.org/10.1038/ncomms11711},
  volume       = {7},
  year         = {2016},
}