Plasmon modes of double-layer graphene at finite temperature

TL;DR

This paper investigates the behavior of plasmon modes in doped double-layer graphene at finite temperature, revealing significant differences from zero-temperature modes, with implications for understanding graphene's electronic properties.

Contribution

It provides a detailed calculation of the dynamical dielectric function and plasmon dispersion in double-layer graphene at finite temperature, a novel analysis in this context.

Findings

Finite temperature significantly alters plasmon modes in doped double-layer graphene.

Plasmon dispersion depends on interlayer separation and layer densities.

Temperature effects are especially pronounced when one layer is undoped.

Abstract

We calculate the dynamical dielectric function of doped double-layer graphene (DLG), made of two parallel graphene monolayers with carrier densities n 1, n2, respectively, and an interlayer separation of d at finite temperature. The results are used to find the dispersion of plasmon modes and loss functions of DLG for several interlayer separations and layer densities. We show that in the case of n 2=0, the temperature plasmon modes are dramatically different from the zero temperature ones.