The two-dimensional Brillouin zone of uniaxially strained graphene

Details The two-dimensional Brillouin zone of uniaxially strained graphene The two-dimensional Brillouin zone of uniaxially strained graphene

2009-08-06

arxiv.org/abs/0908.0895v1

PRB 80, 205410 (2009) http://link.aps.org/doi/10.1103/PhysRevB.80.205410

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.80.205410

We present an in-depth analysis of the electronic and vibrational band structure of uniaxially strained graphene by ab-initio calculations. Depending on the direction and amount of strain, the Fermi crossing moves away from the $K$-point. However, graphene remains semimetallic under small strains. The deformation of the Dirac cone near the $K$-point gives rise to a broadening of the 2D Raman mode. In spite of specific changes in the electronic and vibrational band structure the strain-induced frequency shifts of the Raman active E2g and 2D modes are independent of the direction of strain. Thus, the amount of strain can be directly determined from a single Raman measurement.

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