Effects of Strain on Electronic Properties of Graphene

Details Effects of Strain on Electronic Properties of Graphene Effects of Strain on Electronic Properties of Graphene

2009-08-07

arxiv.org/abs/0908.0977v3

Phys. Rev. B 81, 081407(R) (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 6 figures; Published version

Scientific paper

10.1103/PhysRevB.81.081407

We present first-principles calculations of electronic properties of graphene under uniaxial and isotropic strains, respectively. The semi-metallic nature is shown to persist up to a very large uniaxial strain of 30% except a very narrow strain range where a tiny energy gap opens. As the uniaxial strain increases along a certain direction, the Fermi velocity parallel to it decreases quickly and vanishes eventually, whereas the Fermi velocity perpendicular to it increases by as much as 25%. Thus, the low energy properties with small uniaxial strains can be described by the generalized Weyl's equation while massless and massive electrons coexist with large ones. The work function is also predicted to increase substantially as both the uniaxial and isotropic strain increases. Hence, the homogeneous strain in graphene can be regarded as the effective electronic scalar potential.

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