Semi-Quantized Spin Pumping and Spin-Orbit Torques in Topological Dirac Semimetals

Abstract

We study the time-development processes of spin and charge transport phenomena in a topological Dirac semimetal attached to a ferromagnetic insulator with a precessing magnetization. Compared to conventional normal metals, topological Dirac semimetals manifest a large inverse spin Hall effect when a spin current is pumped from the attached ferromagnetic insulator. It is shown that the induced charge current is semi-quantized, i.e., it depends only on the distance between the two Dirac points in momentum space and hardly depends on the disorder strength when the system remains in the topological Dirac semimetal phase. As an inverse effect, we show that the electric field applied to the topological Dirac semimetal exerts a spin torque on the local magnetization in the ferromagnetic insulator via the exchange interaction and the semi-quantized spin Hall effect. Our study demonstrates that the topological Dirac semimetal offers a less-dissipative platform for spin-charge conversion and spin switching.

6 pages, 3 figures

References in corpus (4)

• Dissipationless Quantum Spin Current at Room Temperature
• Classification of stable three-dimensional Dirac semimetals with nontrivial topology
• Calculation of intrinsic spin Hall conductivity by Wannier interpolation
• Microwave-driven ferromagnet--topological-insulator heterostructures: The prospect for giant spin battery effect and quantized charge pump devices

Cited by in corpus (6)

• Majorana-mediated spin transport without spin polarization in Kitaev quantum spin liquids
• Dynamical spin-to-charge conversion on the edge of quantum spin Hall insulator
• Theory of charge and spin pumping in atomic-scale spiral magnets
• Long-range spin transport on the surface of topological Dirac semimetal
• Gate-Tunable Spin-to-Charge Conversion in Topological Insulator-Magnetic Insulator Heterostructures at Room Temperature
• Nodal lines and boundary modes in topological Dirac semimetals with magnetism