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.

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• Tunable large spin Nernst effect in a two-dimensional magnetic bilayer
• Acousto-magnonic spin Hall effect in honeycomb antiferromagnets
• The Duel of Magnetic Interactions & Structural Instabilities: Itinerant Frustration in the Triangular Lattice Compound LiCrSe${}_2$
• Hybridized magnonic materials for THz frequency applications
• Topological magnon-polarons in honeycomb antiferromagnets with spin-flop transition
• Large Thermal Hall Effect in MnPS${}_3$
• Topological magnon-polaron transport in a bilayer van der Waals magnet
• Long-lived Zone-boundary Magnons in an Antiferromagnet
• Electric polarization induced by magnons and magnon Nernst effects
• Magnetodielectric Properties in Two Dimensional Magnetic Insulators