Radiative decay effects influence the local electromagnetic response of the monolayer graphene with surface corrugations in terahertz range

TL;DR

This paper investigates how surface corrugations and radiative decay affect the local electromagnetic response of monolayer graphene in the terahertz range, providing a theoretical framework that aligns with experimental observations.

Contribution

It introduces a generalized nonlinear self-consistent equation accounting for radiative decay and surface curvature effects in graphene's electromagnetic response.

Findings

Exact solution in linear approximation shows local dephasing depends on surface form.

Qualitative explanation of experimental local current patterns without full quantum models.

Potential basis for imaging surface corrugations from local current patterns.

Abstract

We continue the study of surface corrugations influence on the monolayer graphene local electromagnetic response in terahertz range we started earlier. The effects of radiative decay, double-valley structure of charge carriers spectrum in graphene and the breathing surface curvature form induced synthetic electric fields are taken into account. To fulfill this program the generalized nonlinear self-consistent equation is obtained. In case of weak external alternating electric field for the obtained equation in linear approximation on the external electric field the exact solution is found. It shows that in this case we get local dephasing in induced current paths depending on the surface form . This theoretical result qualitatively explains the corresponding experiments with local current patterns in graphene without using fully quantum approach which is necessary for theoretical description of such phenomenon in graphene nanoribbons. Besides the formulae obtained in the present paper could become the basis of the new method of the imaging of surface corrugations form for given picture of local current paths. The obtained results allow to study mechanical behavior of materials at nanoscale deviates from macroscoping established concepts and this is of particular importance for graphene.