Effect of weak impurities on conductivity of uniaxially strained graphene

TL;DR

This study investigates how large uniaxial strains and weak impurities affect the electrical conductivity and mobility of graphene, revealing strain-induced anisotropy and changes in transport properties through numerical simulations.

Contribution

It introduces a simulation approach combining the Kubo-Greenwood method and tight-binding model to analyze strain and impurity effects on graphene's conductivity.

Findings

Uniaxial strain significantly alters graphene's conductivity and mobility.

Strain induces anisotropy in electron transport properties.

Impurities combined with strain modify scattering and transport behavior.

Abstract

The main goal of our study was investigation of the influence of the deformations (sufficiently large for the establishing the non-zero gap) on electrotransport properties of impure graphene. To achieve this purpose, we implemented the simulation package that allows to perform numerical calculation of the conductivity and mobility of graphene samples subjected to two types of the uniaxial strain: along zigzag and armchair edges. All numerical calculations are performed within the Kubo-Greenwood methodology along with a tight-binding model. Transport properties are studied in case of a presence of impurity atoms described by the weak short-range scattering potential. Various deformation values are considered. The uniaxial strain acts as an additional source of the electron scattering, herewith, can strongly affect both mobility and conductivity of graphene and introduce anisotropy of its electron transport properties.