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

Takahiro Misawa, Kentaro Nomura

Research output: Contribution to journalArticle

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.

Original languageEnglish
Article number19659
JournalScientific reports
Volume9
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • General

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