Spin-orbit torques due to topological insulator surface states: an in-plane magnetization as a probe of extrinsic spin-orbit scattering
arXiv:2306.12557 · doi:10.1088/1361-648X/ad43a6
Abstract
Topological insulator (TI) surface states exert strong spin-orbit torques. When the magnetization is in the plane its interaction with the TI conduction electrons is non-trivial, and is influenced by extrinsic spin-orbit scattering. This is expected to be strong in TIs but is difficult to calculate and to measure unambiguously. Here we show that extrinsic spin-orbit scattering sizably renormalizes the surface state spin-orbit torque resulting in a strong density dependence. The magnitude of the renormalization of the spin torque and the effect of spin-orbit scattering on the relative sizes of the in-plane and out-of-plane field-like torques have strong implications for experiment: We propose two separate experimental signatures for the measurement of its presence.
6 pages, 4 figures
References in corpus (11)
- Topological Insulators with Inversion Symmetry
- Roadmap of spin-orbit torques
- Semiclassical theories of the anomalous Hall effect
- Theory of Spin Hall conductivity in n-doped GaAs
- Anisotropic current-induced spin accumulation in the two-dimensional electron gas with spin-orbit coupling
- Disentangling relativistic spin torques in a ferromagnet/semiconductor bilayer
- Semiclassical equations of motion for disordered conductors: extrinsic interband velocity, corrected collision integral and spin-orbit torques
- Topological nature of the proper spin current and the spin-Hall torque
- Spin-Hall effect due to the bulk states of topological insulators: Extrinsic contribution to the conserved spin current
- Spin transfer torques due to the bulk states of topological insulators
- Spin-orbit torques from topological insulator surface states: Effect of extrinsic spin-orbit scattering on an out-of-plane magnetization