Electric field effect in heat transfer in 2D devices

TL;DR

This paper investigates how an applied electric field influences heat transfer between a 2D material like graphene and a dielectric, revealing additional electrostatic contributions to radiative and phonon heat transfer mechanisms.

Contribution

It introduces a model that accounts for electric field effects on heat transfer in 2D devices, including electrostatic and van der Waals interactions, with numerical analysis for graphene on SiO2.

Findings

Electric field modifies heat transfer via surface charge effects.

Electrostatic and van der Waals interactions contribute to phonon heat transfer.

Numerical results for graphene-SiO2 demonstrate the impact of gate voltage.

Abstract

We calculate heat transfer between a 2D sheet (e.g. graphene) and a dielectric in presence of a gate voltage. The gate potential induces surface charge densities on the sheet and dielectric, which results in electric field, which is coupled to the surface displacements and, as a consequence, resulting an additional contributions to the radiative heat transfer. The electrostatic and van der Waals interactions between the surface displacement result in the phonon heat transfer, which we calculate taking into account the nonlocality of these interactions. Numerical calculations are presented for heat transfer between graphene and a SiO$_2$ substrate.