• 文献标题:   Photoprotected spin Hall effect on graphene with substrate induced Rashba spin-orbit coupling
  • 文献类型:   Article
  • 作  者:   LOPEZ A, MOLINA RA
  • 作者关键词:   graphene, topological, floquet
  • 出版物名称:   JOURNAL OF PHYSICSCONDENSED MATTER
  • ISSN:   0953-8984 EI 1361-648X
  • 通讯作者地址:   Escuela Super Politecn Litoral
  • 被引频次:   0
  • DOI:   10.1088/1361-648X/ab6cc0
  • 出版年:   2020

▎ 摘  要

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.