Magnetoelastic coupling enabled tunability of magnon spin current generation in 2D antiferromagnets

TL;DR

This paper theoretically explores how magnetoelastic coupling influences magnon spin current generation in 2D antiferromagnetic materials, revealing mechanisms for tunable spin transport via electric fields and material properties.

Contribution

It introduces a theoretical framework for understanding and predicting magnetoelastic effects on magnon transport in 2D antiferromagnets, highlighting tunability of spin currents.

Findings

Magnetoelastic coupling significantly enhances the spin-Nernst coefficient.

Magnetic anisotropy controls magnon-phonon hybridization and Berry curvature.

Electric field modulation can tune spin current generation in 2D magnets.

Abstract

We theoretically investigate the magnetoelastic coupling (MEC) and its effect on magnon transport in two-dimensional antiferromagnets with a honeycomb lattice. MEC coeffcient along with magnetic exchange parameters and spring constants are computed for monolayers of transition metal trichalcogenides with N\'eel order ($\text{MnPS}_3$ and $\text{VPS}_3$) and zigzag order ($\text{CrSiTe}_3$, $\text{NiPS}_3$ and $\text{NiPSe}_3$) by $ab$ $initio$ calculations. Using these parameters, we predict that the spin-Nernst coefficient is significantly enhanced due to magnetoelastic coupling. Our study shows that although Dzyaloshinskii-Moriya interaction can produce spin Nernst effect in these materials, other mechanisms such as magnon-phonon coupling should be taken into account. We also demonstrate that the magnetic anisotropy is an important factor for control of magnon-phonon hybridization and enhancement of the Berry curvature and thus the spin-Nernst coefficient. Our results pave the way towards gate tunable spin current generation in 2D magnets by SNE via electric field modulation of MEC and anisotropy.