The effect of sublattice symmetry breaking on the electronic properties of a doped graphene

TL;DR

This paper investigates how breaking sublattice symmetry affects the electronic properties of doped graphene, revealing changes in quasiparticle behavior, spectral functions, and the disappearance of plasmaron peaks due to mass generation.

Contribution

It provides a detailed many-body G$_0$W calculation of the quasiparticle self-energy and spectral function in symmetry-broken doped graphene, highlighting the impact of a band gap.

Findings

Mass generation in graphene suppresses the plasmaron peak.

Band gap renormalization varies with electron density.

Spectral function and Fermi velocity are significantly affected by symmetry breaking.

Abstract

Motivated by a number of recent experimental studies, we have carried out the microscopic calculation of the quasiparticle self-energy and spectral function in a doped graphene when a symmetry breaking of the sublattices is occurred. Our systematic study is based on the many-body G$_0$W approach that is established on the random phase approximation and on graphene's massive Dirac equation continuum model. We report extensive calculations of both the real and imaginary parts of the quasiparticle self-energy in the presence of a gap opening. We also present results for spectral function, renormalized Fermi velocity and band gap renormalization of massive Dirac Fermions over a broad range of electron densities. We further show that the mass generating in graphene washes out the plasmaron peak in spectral weight.