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

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 Néel 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.

References in corpus (5)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Anomalous transport due to Weyl fermions in the chiral antiferromagnets Mn${}_3$$X$, $X$ = Sn, Ge
• Signature of magnon Nernst effect in an antiferromagnetic insulator
• Berry curvature in magnon-phonon hybrid systems
• Topological Magnetoelastic Excitations in Non-Collinear Antiferromagnets

Cited by in corpus (1)

• A Perspective on Magnon Spin Nernst Effect in Antiferromagnets