Strain effects in graphene and graphene nanoribbons: The underlying mechanism
Graphene, graphene nanoribbons (GNRs), band gap, strain, first-principles calculations, tight-binding model
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.
Tsinghua University Press
Yang Li,Xiaowei Jiang,Zhongfan Liu,Zhirong Liu, Strain effects in graphene and graphene nanoribbons: The underlying mechanism. NanoRes.2010, 3: 545–556