Valley-dependent spin-orbit torques in two-dimensional hexagonal crystals
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
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AbstractWe study spin-orbit torques in two-dimensional hexagonal crystals such as graphene, silicene, germanene, and stanene. The torque possesses two components, a fieldlike term due to inverse spin galvanic effect and an antidamping torque originating from Berry curvature in mixed spin-k space. In the presence of staggered potential and exchange field, the valley degeneracy can be lifted and we obtain a valley-dependent Berry curvature, leading to a tunable antidamping torque by controlling the valley degree of freedom. The valley imbalance can be as high as 100% by tuning the bias voltage or magnetization angle. These findings open new venues for the development of current-driven spin-orbit torques by structural design.
CitationValley-dependent spin-orbit torques in two-dimensional hexagonal crystals 2016, 93 (3) Physical Review B
PublisherAmerican Physical Society (APS)
JournalPhysical Review B