Intrinsic anomalous spin Hall effect

TL;DR

This paper demonstrates that the anomalous spin Hall effect (ASHE) in certain materials is an intrinsic phenomenon driven by order-parameter-controlled spin-orbit interactions, enabling new ways to generate and detect spin currents.

Contribution

It confirms the existence of the anomalous SHE in Mn2Au and WTe2 and elucidates its origin as an intrinsic effect related to spin Berry curvature and order parameter interactions.

Findings

ASHE confirmed in Mn2Au and WTe2

ASHE originates from spin-orbit interaction modulated by order parameter

Provides a relationship among order parameter, spin Berry curvature, and ASHC

Abstract

Charge-spin interconversion in magnetic materials is investigated by using first-principles calculations. In addition to the conventional spin Hall effect (SHE) that requires mutual orthogonality of the charge current, spin-flow direction, and spin polarization, the recently proposed anomalous SHE (ASHE) is confirmed in Mn2Au and WTe2. The interaction of the order parameter with conduction electrons leads to sizeable nonzero spin Berry curvatures that give rise to nonzero anomalous spin Hall conductivity (ASHC). Our calculations show that the ASHE is intrinsic and originates from the order-parameter-controlled spin-orbit interaction, which generates an extra anomalous effective field. A useful relationship among the order parameter, spin Berry curvature and ASHC is revealed. Our findings open a new avenue for arbitrary-type spin current generation and detection.