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Giant valley-Zeeman coupling in the surface layer of an intercalated transition metal dichalcogenide
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Edwards, B., Dowinton, O., Hall, A. E., Murgatroyd, P. A. E., Buchberger, S., Antonelli, T., Siemann, G.-R., Rajan, A., Morales, E. Abarca, Zivanovic, A., Bigi, C., Belosludov, R. V., Polley, C. M., Carbone, D., Mayoh, Daniel, Balakrishnan, Geetha, Bahramy, M. S. and King, P. D. C. (2023) Giant valley-Zeeman coupling in the surface layer of an intercalated transition metal dichalcogenide. Nature Materials, 22 (4). pp. 459-465. doi:10.1038/s41563-022-01459-z ISSN 1476-1122.
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Official URL: http://doi.org/10.1038/s41563-022-01459-z
Abstract
Spin–valley locking is ubiquitous among transition metal dichalcogenides with local or global inversion asymmetry, in turn stabilizing properties such as Ising superconductivity, and opening routes towards ‘valleytronics’. The underlying valley–spin splitting is set by spin–orbit coupling but can be tuned via the application of external magnetic fields or through proximity coupling. However, only modest changes have been realized to date. Here, we investigate the electronic structure of the V-intercalated transition metal dichalcogenide V1/3NbS2 using microscopic-area spatially resolved and angle-resolved photoemission spectroscopy. Our measurements and corresponding density functional theory calculations reveal that the bulk magnetic order induces a giant valley-selective Ising coupling exceeding 50 meV in the surface NbS2 layer, equivalent to application of a ~250 T magnetic field. This energy scale is of comparable magnitude to the intrinsic spin–orbit splittings, and indicates how coupling of local magnetic moments to itinerant states of a transition metal dichalcogenide monolayer provides a powerful route to controlling their valley–spin splittings.
Item Type: | Journal Article | ||||||||||
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Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
Library of Congress Subject Headings (LCSH): | Transition metals, Transition metal compounds, Ising model , Valleytronics , Nuclear spin, Photoemission , Density functionals | ||||||||||
Journal or Publication Title: | Nature Materials | ||||||||||
Publisher: | Nature Publishing Group | ||||||||||
ISSN: | 1476-1122 | ||||||||||
Official Date: | 1 April 2023 | ||||||||||
Dates: |
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Volume: | 22 | ||||||||||
Number: | 4 | ||||||||||
Page Range: | pp. 459-465 | ||||||||||
DOI: | 10.1038/s41563-022-01459-z | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||
Copyright Holders: | The Authors | ||||||||||
Date of first compliant deposit: | 11 April 2023 | ||||||||||
Date of first compliant Open Access: | 19 July 2023 | ||||||||||
RIOXX Funder/Project Grant: |
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