# Optomechanical measurement of thermal transport in two-dimensional MoSe2 lattices

## TL;DR

This paper demonstrates a novel mechanical sensing method to measure thermal conductivity and specific heat in monolayer MoSe2 at cryogenic temperatures, revealing phonon heat transport in 2D materials.

## Contribution

It introduces a new approach using nanomechanical resonators to measure thermal properties of 2D materials at cryogenic temperatures.

## Key findings

- Thermal conductivity and specific heat measured down to cryogenic temperatures.
- Results align with first-principles predictions.
- Provides insights into phonon-mediated heat transport in 2D systems.

## Abstract

Nanomechanical resonators have emerged as sensors with exceptional sensitivities. These sensing capabilities open new possibilities in the studies of the thermodynamic properties in condensed matter. Here, we use mechanical sensing as a novel approach to measure the thermal properties of low-dimensional materials. We measure the temperature dependence of both the thermal conductivity and the specific heat capacity of a transition metal dichalcogenide (TMD) monolayer down to cryogenic temperature, something that has not been achieved thus far with a single nanoscale object. These measurements show how heat is transported by phonons in two-dimensional systems. Both the thermal conductivity and the specific heat capacity measurements are consistent with predictions based on first-principles.