Electrodynamic properties of graphene and their technological applications

TL;DR

This paper explores the electrodynamic properties of graphene, focusing on plasmons, plasmon-phonon interactions, and their applications in near-field heat transfer and thermophotovoltaics, revealing new insights into light-matter interactions in 2D materials.

Contribution

It provides a comprehensive analysis of plasmon-phonon interactions, transverse plasmons in bilayer graphene, and applications in near-field heat transfer and thermophotovoltaics, advancing understanding of graphene's electrodynamics.

Findings

Electron-phonon interaction causes significant plasmon damping.

Strong plasmon-phonon coupling occurs when their energies are similar.

Graphene can enhance near-field heat transfer and act as an efficient thermal emitter.

Abstract

Graphene is a novel two-dimensional material with fascinating electrodynamic properties like the ability to support collective electron oscillations (plasmons) accompanied by tight confinement of electromagnetic fields. Our goal is to explore light-matter interaction in graphene in the context of plasmonics and other technological applications but also to use graphene as a platform for studying many body physics like the interaction between plasmons, phonons and other elementary excitations. Plasmons and plasmon-phonon interaction are analyzed within the self-consistent linear response approximation. We demonstrate that electron-phonon interaction leads to large plasmon damping when plasmon energy exceeds that of the optical phonon but also a peculiar mixing of plasmon and optical phonon polarizations. Plasmon-phonon coupling is strongest when these two excitations have similar energy and momentum. We also analyze properties of transverse electric plasmons in bilayer graphene. Finally we show that thermally excited plasmons strongly mediate and enhance the near field radiation transfer between two closely separated graphene sheets. We also demonstrate that graphene can be used as a thermal emitter in the near field thermophotovoltaics leading to large efficiencies and power densities. Near field heat transfer is analyzed withing the framework of fluctuational electrodynamics.