Valley-dependent spin-orbit torques in two dimensional hexagonal crystals

Abstract

We study spin-orbit torques in two dimensional hexagonal crystals such as graphene, silicene, germanene and stanene. The torque possesses two components, a field-like 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.

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Cited by in corpus (6)

• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
• Topological resonance and single-optical-cycle valley polarization in gapped graphene
• Semiclassical theory of spin-orbit torques in disordered multiband electron systems
• Spin splitting and spin Hall conductivity in buckled monolayers of the group 14: First-principles calculations
• Tunable spin-charge conversion through topological phase transitions in zigzag nanoribbons
• Spin accumulation in disordered topological insulator thin films