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.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Misawa T,Nomura K

doi

10.1038/s41598-019-55802-7

subject

Has Abstract

pub_date

2019-12-23 00:00:00

pages

19659

issue

1

issn

2045-2322

pii

10.1038/s41598-019-55802-7

journal_volume

9

pub_type

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