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

Lewis Bawden; S. P.  Cooil; Jonathon Mark Riley; Liam James Collins-McIntyre; Veronika Sunko; K. Hunvik; M. Leandersson; C. M.  Polley; T.  Balasubramanian; T. K.  Kim; M.  Hoesch; J. W.  Wells; G. Balakrishnan; M. S.  Bahramy; Philip David King

doi:10.1038/ncomms11711

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

Lewis Bawden, S. P. Cooil, Jonathon Mark Riley, Liam James Collins-McIntyre, Veronika Sunko, K. Hunvik, M. Leandersson, C. M. Polley, T. Balasubramanian, T. K. Kim, M. Hoesch, J. W. Wells, G. Balakrishnan, M. S. Bahramy, Philip David King

Research output: Contribution to journal › Article › peer-review

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 andorigins 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 characterised 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 spintexture. These findings necessitate a re-investigation of the nature of charge order and superconducting pairing in NbSe₂ and related TMDCs.

Original language	English
Article number	11711
Number of pages	6
Journal	Nature Communications
Volume	7
DOIs	https://doi.org/10.1038/ncomms11711
Publication status	Published - 23 May 2016

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CM DTC 2014 - 2022: EPSRC centre for doctoral training in condensed matter physics: Renewal of the CM-DTC
King, P. (PI)
EPSRC
1/08/14 → 31/01/24
Project: Standard
Royal Society Research Fellowship: Electronic structure engineering of novel topological phases
King, P. (PI)
The Royal Society
1/10/13 → 30/09/18
Project: Fellowship
Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems
Wahl, P. (PI), Baumberger, F. (CoI), Davis, J. C. (CoI), Green, A. (CoI), Hooley, C. (CoI), Keeling, J. M. J. (CoI) & Mackenzie, A. (CoI)
EPSRC
1/09/11 → 31/08/17
Project: Standard

Data underpinning - Spin-valley locking in the normal state of a transition-metal dichalocogenide superconductor
Bawden, L. (Creator), Cooil, S. P. C. (Creator), Mazzola, F. (Creator), Riley, J. M. (Creator), Collins-McIntyre, L. J. (Creator), Sunko, V. (Creator), Hunvik, K. (Creator), Leandersson, M. (Creator), Polley, C. M. (Creator), Balasubramanian, T. (Creator), Kim, T. K. (Creator), Hoesch, M. (Creator), Wells, J. W. (Creator), Balakrishnan, G. (Creator), Bahramy, M. S. (Creator) & King, P. D. (Creator), University of St Andrews, 25 May 2016
DOI: 10.17630/edd53357-41e3-4313-9e5e-a0e7780ef4be
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Bawden, L., Cooil, S. P., Riley, J. M., Collins-McIntyre, L. J., Sunko, V., Hunvik, K., 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, 7, Article 11711. https://doi.org/10.1038/ncomms11711

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title = "Spin-valley locking in the normal state of a transition-metal dichalcogenide superconductor",

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 andorigins 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 characterised 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 spintexture. These findings necessitate a re-investigation of the nature of charge order and superconducting pairing in NbSe2 and related TMDCs.",

author = "Lewis Bawden and Cooil, {S. P.} and Riley, {Jonathon Mark} and Collins-McIntyre, {Liam James} and Veronika Sunko and K. Hunvik and M. Leandersson and Polley, {C. M.} and T. Balasubramanian and Kim, {T. K.} and M. Hoesch and Wells, {J. W.} and G. Balakrishnan and Bahramy, {M. S.} and King, {Philip David}",

note = "We gratefully acknowledge support from the Engineering and Physical Sciences Research Council, UK (work at St Andrews under Grant No. EP/I031014/1 and work at Warwick under Grant No. EP/M028771/1) and the International Max Planck partnership. PDCK acknowledges support from the Royal Society through a University Research Fellowship. MSB was supported by the Grant-in-Aid for Scientific Research (S) (No. 24224009) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan. LB, JR, and VS acknowledge studentship funding from EPSRC through grant nos. EP/G03673X/1, EP/L505079/1, and EP/L015110/1, respectively. The experiments at MAX IV Laboratory were made possible through funding from the Swedish Research Council and the Knut and Alice Wallenberg Foundation.",

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T1 - Spin-valley locking in the normal state of a transition-metal dichalcogenide superconductor

AU - Bawden, Lewis

AU - Cooil, S. P.

AU - Riley, Jonathon Mark

AU - Collins-McIntyre, Liam James

AU - Sunko, Veronika

AU - Hunvik, K.

AU - Leandersson, M.

AU - Polley, C. M.

AU - Balasubramanian, T.

AU - Kim, T. K.

AU - Hoesch, M.

AU - Wells, J. W.

AU - Balakrishnan, G.

AU - Bahramy, M. S.

AU - King, Philip David

N1 - We gratefully acknowledge support from the Engineering and Physical Sciences Research Council, UK (work at St Andrews under Grant No. EP/I031014/1 and work at Warwick under Grant No. EP/M028771/1) and the International Max Planck partnership. PDCK acknowledges support from the Royal Society through a University Research Fellowship. MSB was supported by the Grant-in-Aid for Scientific Research (S) (No. 24224009) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan. LB, JR, and VS acknowledge studentship funding from EPSRC through grant nos. EP/G03673X/1, EP/L505079/1, and EP/L015110/1, respectively. The experiments at MAX IV Laboratory were made possible through funding from the Swedish Research Council and the Knut and Alice Wallenberg Foundation.

PY - 2016/5/23

Y1 - 2016/5/23

N2 - 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 andorigins 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 characterised 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 spintexture. These findings necessitate a re-investigation of the nature of charge order and superconducting pairing in NbSe2 and related TMDCs.

AB - 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 andorigins 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 characterised 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 spintexture. These findings necessitate a re-investigation of the nature of charge order and superconducting pairing in NbSe2 and related TMDCs.

U2 - 10.1038/ncomms11711

DO - 10.1038/ncomms11711

M3 - Article

SN - 2041-1723

VL - 7

JO - Nature Communications

JF - Nature Communications

M1 - 11711

ER -

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

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Projects

CM DTC 2014 - 2022: EPSRC centre for doctoral training in condensed matter physics: Renewal of the CM-DTC

Royal Society Research Fellowship: Electronic structure engineering of novel topological phases

Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems

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Data underpinning - Spin-valley locking in the normal state of a transition-metal dichalocogenide superconductor

Cite this