Inverse Ising effect and Ising magnetoresistance

TL;DR

This paper theoretically investigates the inverse Ising effect in WTe2, revealing unconventional spin-to-charge conversion and predicting Ising magnetoresistance, advancing understanding of spin-momentum locking and spin-charge phenomena in Ising SOC systems.

Contribution

It introduces the concept of inverse Ising effect and predicts Ising magnetoresistance in WTe2 heterostructures, offering new insights into spin-charge conversion mechanisms.

Findings

Predicted unconventional spin-to-charge conversion with non-orthogonal spin and charge currents.

Proposed Ising magnetoresistance dependent on out-of-plane magnetic moment.

Provided a theoretical framework for spin-momentum locking in Ising SOC systems.

Abstract

Ising (Zeeman-type) spin-orbit coupling (SOC) generated by in-plane inverse asymmetry has attracted considerable attention, especially in Ising superconductors and spin-valley coupling physics. However, many unconventional observations and emerging physical phenomena remain to be elucidated. Here, we theoretically study the spin texture of {\sigma}_z (spin angular momentum projection along z) induced by Ising SOC in 1Td WTe2, and propose an unconventional spin-to-charge conversion named inverse Ising effect, in which the directions of the spin current, spin polarization and charge current are not orthogonal. In particular, we predict the Ising magnetoresistance, whose resistance depends on the out-of-plane magnetic momentum in WTe2/ferromagnetic heterostructure. The Ising magnetoresistance is believed to be an interesting counterpart to the well studied spin Hall magnetoresistance. Our predictions provide promising way to spin-momentum locking and spin-charge conversion based on emerging Ising SOC.