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Updated: Dec 30, 2025

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Photoprotected spin Hall effect on graphene with substrate induced Rashba spin-orbit coupling
Alexander López1, Rafael A Molina2
1Escuela Superior Politécnica del Litoral, ESPOL, Departamento de Física, Campus Gustavo Galindo Km 30.5 Vía Perimetral, PO Box, 09-01-5863, Guayaquil, Ecuador.
Abstract:
We propose an experimental realization of the spin Hall effect in graphene by illuminating a graphene sheet on top of a substrate with circularly polarized monochromatic light. The substrate induces a controllable Rashba type spin-orbit coupling which breaks the spin-degeneracy of the Dirac cones but it is gapless. The circularly polarized light induces a gap in the spectrum and turns graphene into a Floquet topological insulator with spin dependent edge states. By analyzing the high and intermediate frequency regimes, we find that in both parameter limits, the spin-Chern number can be tuned by the effective coupling strength of the charge particles to the radiation field and determine the condition for the photoinduced topological phase transition.
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