Quasiparticle renormalization in ABC graphene trilayers

TL;DR

This paper studies how electron-electron interactions affect quasiparticles in ABC graphene trilayers, revealing renormalized dynamical exponents and well-defined quasiparticles at low energies.

Contribution

It introduces a detailed analysis of self-energy corrections and quasiparticle properties in ABC graphene trilayers, highlighting the renormalization of the dynamical exponent and observable physical effects.

Findings

Renormalization of dynamical exponent to z=3+α₁/N

Quasiparticles remain well-defined at zero energy

Physical observables are affected by electron-electron interactions

Abstract

We investigate the effect of electron-electron interactions in ABC stacked graphene trilayers. In the gapless regime, we show that the self-energy corrections lead to the renormalization of the dynamical exponent $z=3+\alpha_{1}/N$, with $\alpha_{1}\approx0.52$ and $N$ is the number of fermionic species. Although the quasiparticle residue is suppressed near the neutrality point, the lifetime has a sublinear scaling with the energy and the quasiparticles are well defined even at zero energy. We calculate the renormalization of different physical observables, which can be directly measured in experiments.