Spectral and polarization dependencies of luminescence by hot carriers in graphene

TL;DR

This paper theoretically analyzes how hot carrier luminescence in graphene depends on spectral, energetic, and polarization factors, considering different sample types and external controls like electric fields and gate voltages.

Contribution

It provides a comprehensive theoretical analysis of the spectral, polarization, and efficiency dependencies of hot carrier luminescence in graphene, including effects of sample size and external parameters.

Findings

Luminescence depends on electric field and gate voltage.

Polarization is determined by the angle between propagation and normal.

Efficiency varies with sample size and averaging over angles.

Abstract

The luminescence caused by the interband transitions of hot carriers in graphene is considered theoretically. The dependencies of emission in mid- and near-IR spectral regions versus energy and concentration of hot carriers are analyzed; they are determined both by an applied electric field and a gate voltage. The polarization dependency is determined by the angle between the propagation direction and the normal to the graphene sheet. The characteristics of radiation from large-scale-area samples of epitaxial graphene and from microstructures of exfoliated graphene are considered. The averaged over angles efficiency of emission is also presented.