In the calculations of lattice thermal conductivity (κL), vital contributions stemming from four-phonon scattering is often neglected. The significance of four-phonon scattering in the thermal transport properties of monolayer (ML) MoS2 has been unraveled using first-principles calculations combined with the Boltzmann transport equation. If only three-phonon scattering processes are considered then the κL is found to be significantly overestimated (∼115.8Wm−1K−1 at 300 K).
