# Significant reduction of lattice thermal conductivity in suspended graphene by charge doping

## TL;DR

This study demonstrates that inducing charge doping in suspended graphene significantly reduces its lattice thermal conductivity by about 50% at 200 K, enhancing its potential for thermoelectric applications.

## Contribution

The paper provides first-principles calculations showing how charge doping can effectively lower graphene's thermal conductivity through electron-phonon interactions.

## Key findings

- Charge doping reduces thermal conductivity by ~50% at 200 K.
- Electron-phonon scattering dominates phonon scattering in high electron density graphene.
- Potential for improved thermoelectric performance in graphene.

## Abstract

Declining the lattice thermal conductivity in graphene is essential for its thermoelectric applications. In high electron density systems, scatterings of phonons by electrons are no less than the phonon scatterings by other phonons. With the aid of first-principle calculations we examine the lattice thermal conductivity in graphene by inducing electron-phonon scattering externally. With experimentally tunable charge carrier density we find $\sim 50\%$ reduction of the lattice thermal conductivity at 200 K. The present study opens up new avenues for potential thermoelectric applications of graphene.