Thermal conductivity and tunable thermal anisotropy of magnetic CrSBr monolayer

Abstract

We present first-principles calculations of the thermal conductivity, $\mathbf{\kappa }$, of monolayer CrSBr, a van der Waals magnetic 2D material. We find a considerable thermal anisotropy, with a ratio ${\kappa }_{xx}/{\kappa }_{yy}$ of around 1.8. The anisotropy stems from a combined effect of phonon velocities and lifetimes and can be tuned by controlling the flake size by suppressing long mean path phonons.