, Volume 3, Issue 8, pp 545-556,
Open Access This content is freely available online to anyone, anywhere at any time.
Date: 26 Jul 2010

Strain effects in graphene and graphene nanoribbons: The underlying mechanism

Abstract

A tight-binding analytic framework is combined with first-principles calculations to reveal the mechanism underlying the strain effects on electronic structures of graphene and graphene nanoribbons (GNRs). It provides a unified and precise formulation of the strain effects under various circumstances-including the shift of the Fermi (Dirac) points, the change in band gap of armchair GNRs with uniaxial strain in a zigzag pattern and its insensitivity to shear strain, and the variation of the k-range of edge states in zigzag GNRs under uniaxial and shear strains which determine the gap behavior via the spin polarization interaction.

http://static-content.springer.com/image/art%3A10.1007%2Fs12274-010-0015-7/MediaObjects/12274_2010_15_Fig1_HTML.gif