Electronic ground state properties of strained graphene

TL;DR

This paper investigates how uniaxial strain affects the electronic properties of graphene, revealing strain-dependent changes in quasiparticle behavior, Fermi velocity, and charge compressibility through theoretical calculations.

Contribution

It provides a detailed theoretical analysis of strain effects on graphene's electronic properties using tight-binding and Hartree-Fock methods, aligning with recent experimental findings.

Findings

Charge compressibility increases with stretching and decreases with compression.

Fermi velocity renormalization is reduced along the deformation direction.

Quasiparticle properties are highly sensitive to strain magnitude and sign.

Abstract

We consider the effect of the Coulomb interaction in strained graphene using tight-binding approximation together with the Hartree-Fock interactions. The many-body energy dispersion relation, anisotropic Fermi velocity renormalization and charge compressibility in the presence of uniaxial strain are calculated. We show that the quasiparticle quantities are sensitive to homogenous strain and indeed, to its sign. The charge compressibility is enhanced by stretching and suppressed by compressing a graphene sheet. We find a reduction of Fermi velocity renormalization along the direction of graphene deformation, in good agreement with the recent experimental observation.