Giant valley-Zeeman coupling in the surface layer of an intercalated transition metal dichalcogenide.

Autor: Edwards B; SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, UK., Dowinton O; Department of Physics and Astronomy, University of Manchester, Manchester, UK., Hall AE; Department of Physics, University of Warwick, Coventry, United Kingdom., Murgatroyd PAE; SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, UK., Buchberger S; SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, UK.; Max Planck Institute for Chemical Physics of Solids, Dresden, Germany., Antonelli T; SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, UK., Siemann GR; SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, UK., Rajan A; SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, UK., Morales EA; SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, UK.; Max Planck Institute for Chemical Physics of Solids, Dresden, Germany., Zivanovic A; SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, UK.; Max Planck Institute for Chemical Physics of Solids, Dresden, Germany., Bigi C; SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, UK., Belosludov RV; Institute for Materials Research, Tohoku University, Sendai, Japan., Polley CM; MAX IV Laboratory, Lund University, Lund, Sweden., Carbone D; MAX IV Laboratory, Lund University, Lund, Sweden., Mayoh DA; Department of Physics, University of Warwick, Coventry, United Kingdom., Balakrishnan G; Department of Physics, University of Warwick, Coventry, United Kingdom., Bahramy MS; Department of Physics and Astronomy, University of Manchester, Manchester, UK. m.saeed.bahramy@manchester.ac.uk., King PDC; SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, UK. pdk6@st-andrews.ac.uk.
Jazyk: angličtina
Zdroj: Nature materials [Nat Mater] 2023 Apr; Vol. 22 (4), pp. 459-465. Date of Electronic Publication: 2023 Jan 19.
DOI: 10.1038/s41563-022-01459-z
Abstrakt: 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 V 1/3 NbS 2 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 NbS 2 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.
(© 2023. The Author(s), under exclusive licence to Springer Nature Limited.)
Databáze: MEDLINE
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