Dynamical properties of quasiparticles in a gapped graphene sheet

TL;DR

This paper investigates how charge carrier interactions affect quasiparticle properties in gapped graphene, revealing velocity suppression, lifetime reduction, and mean free path decrease as the energy gap varies.

Contribution

It provides a detailed numerical analysis of quasiparticle dynamical properties in gapped graphene using the many-body G0W approximation, highlighting the effects of the energy gap.

Findings

Renormalized velocity is nearly independent of carrier density at high densities.

Quasiparticle lifetime decreases with increasing energy gap.

Mean free path of charge carriers is suppressed as the energy gap increases.

Abstract

We present numerical calculations of the impact of charge carriers-carriers interactions on the dynamical properties of quasiparticles such as renormalized velocity and quasiparticle inelastic scattering lifetime in a gapped graphene sheet. Our formalism is based on the many-body $G_0W$-approximation for the self-energy. We present results for the many-body renormalized velocity suppression and the renormalization constant over a broad range of energy gap values. We find that the renormalized velocity is almost independence of the carrier densities at large density regime. We also show that the quasiparticle inelastic scattering lifetime decreases by increasing the gap value. Finally, we present results for the mean free path of charge carriers suppression over the energy gap values.