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Valley-spin polarization at zero magnetic field induced by strong hole-hole interactions in monolayer WSe₂

From National Research Council Canada

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DOIResolve DOI: https://doi.org/10.1126/sciadv.adu4696
AuthorSearch for: 1ORCID identifier: https://orcid.org/0009-0004-9260-1686; Search for: 1ORCID identifier: https://orcid.org/0000-0002-2238-336X; Search for: 1ORCID identifier: https://orcid.org/0000-0002-5729-1895; Search for: 1; Search for: 1; Search for: ORCID identifier: https://orcid.org/0000-0003-3701-8119; Search for: ORCID identifier: https://orcid.org/0000-0002-1467-3105; Search for: ORCID identifier: https://orcid.org/0000-0003-3638-3966; Search for: ORCID identifier: https://orcid.org/0000-0002-2908-4645; Search for: ORCID identifier: https://orcid.org/0000-0002-4651-3536; Search for: ORCID identifier: https://orcid.org/0000-0001-9537-4600; Search for: 1ORCID identifier: https://orcid.org/0000-0002-1929-2715
Affiliation
  1. National Research Council of Canada. Quantum and Nanotechnologies
FormatText, Article
Abstract
Monolayer transition metal dichalcogenides have emerged as prominent candidates to explore the complex interplay between spin and valley degrees of freedom. Their strong spin-orbit interaction and broken inversion symmetry lead to the spin-valley locking effect, in which carriers occupying the K and K′ valleys of the reciprocal space must have opposite spins. This effect is particularly strong for holes due to a larger spin-orbit gap in the valence band. By reducing the dimensionality of a monolayer of WSe₂ to 1D via electrostatic confinement, we demonstrate that spin-valley locking and strong hole-hole interactions lead to a ferromagnetic state where hole transport is spin-valley polarized, even without an applied magnetic field. A massive Dirac fermion model in the Hartree-Fock approximation reveals that many-body hole-exchange interactions lead to this polarized ground-state. This observation opens the possibility of implementing a robust and stable valley-polarized system, essential in valleytronic applications.
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PublisherAmerican Association for the Advancement of Science
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  • Science Advances 11, no. 19 (7 May 2025).
LanguageEnglish
Peer reviewedYes
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Record identifier24e34f61-5ae5-42c9-8ed7-7d51833385be
Record created2025-07-18
Record modified2025-07-18
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