Thermal conductivity and tunable thermal anisotropy of magnetic CrSBr monolayer

TL;DR

This study uses first-principles calculations to analyze the thermal conductivity and anisotropy of monolayer CrSBr, revealing significant tunable anisotropic heat transport properties in this magnetic 2D material.

Contribution

It provides the first detailed computational analysis of thermal conductivity and anisotropy in monolayer CrSBr, highlighting how size control can tune phonon transport.

Findings

Thermal conductivity anisotropy ratio of about 1.8

Anisotropy caused by phonon velocities and lifetimes

Size control can suppress long mean path phonons to tune anisotropy

Abstract

We present first-principles calculations of the thermal conductivity, ${\bm \kappa}$, 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.