Emergence of radial Rashba spin-orbit fields in twisted van der Waals heterostructures
arxiv(2024)
摘要
Rashba spin-orbit coupling is a quintessential spin interaction appearing in
virtually any electronic heterostructure. Its paradigmatic spin texture in the
momentum space forms a tangential vector field. Using first-principles
investigations, we demonstrate that in twisted homobilayers and
hetero-multilayers, the Rashba coupling can be predominantly radial, parallel
to the momentum. Specifically, we study four experimentally relevant
structures: twisted bilayer graphene (Gr), twisted bilayer WSe_2, and twisted
multilayers WSe_2/Gr/WSe_2 and WSe_2/Gr/Gr/WSe_2. We show, that the
Rashba spin-orbit field texture in such structures can be controlled by an
electric field, allowing to tune it from radial to tangential. Such spin-orbit
engineering should be useful for designing novel spin-charge conversion and
spin-orbit torque schemes, as well as for controlling correlated phases and
superconductivity in van der Waals materials.
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