Impact of electron-electron Coulomb interaction on the high harmonic generation process in graphene

TL;DR

This paper develops a microscopic theory to analyze how electron-electron Coulomb interactions influence high harmonic generation in graphene under strong laser fields, revealing the importance of many-body effects.

Contribution

It introduces a dynamic Hartree-Fock based model to incorporate Coulomb interactions into the nonlinear optical response of graphene, advancing understanding of many-body effects in HHG.

Findings

Coulomb interactions significantly affect high harmonic generation in graphene.

Numerical solutions highlight the role of many-body effects in nonlinear optical processes.

The developed model provides a framework for future studies of electron interactions in 2D materials.

Abstract

Generation of high harmonics in a monolayer graphene initiated by strong coherent radiation field, taking into account electron-electron Coulomb interaction is investigated. A microscopic theory describing the nonlinear optical response of graphene is developed. The Coulomb interaction of electrons is treated in the scope of dynamic Hartree-Fock approximation. The closed set of integrodifferential equations for the single-particle density matrix of a graphene quantum structure is solved numerically. The obtained solutions show the significance of many-body Coulomb interaction on the high harmonic generation process in graphene.