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We study the time-development processes of spin and charge transportphenomena in a topological Dirac semimetal attached to a ferromagneticinsulator with a precessing magnetization. Compared to conventional normalmetals, topological Dirac semimetals manifest a large inverse spin Hall effectwhen a spin current is pumped from the attached ferromagnetic insulator. It isshown that the induced charge current is semi-quantized, i.e., it depends onlyon the distance between the two Dirac points in momentum space and hardlydepends on the disorder strength when the system remains in the topologicalDirac semimetal phase. As an inverse effect, we show that the electric fieldapplied to the topological Dirac semimetal exerts a spin torque on the localmagnetization in the ferromagnetic insulator via the exchange interaction andthe semi-quantized spin Hall effect. Our study demonstrates that thetopological Dirac semimetal offers a less-dissipative platform for spin-chargeconversion and spin switching.

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