Tension effect on the absorbance of a graphene layer

Abstract

The effect of uniform planar tension on the absorbance of a graphene layer located between air and a semi-infinite dielectric medium has been investigated. The results show that the magnitude of the Van Hove peaks in the absorbance of the graphene depends on the tension direction, the strain modulus and the angle between the tension direction and the tangential electric field. While, the frequency location of the Van Hove peaks only depends on the tension direction and the strain modulus and is independent from the angle between the tension direction and the tangential electric field. When the tangential electric field is perpendicular to one of the vectors connecting a given carbon atom to its nearest neighbours, the related peak disappears. While, for the tangential electric field parallel to those vectors, the related peak acquires its largest value. Moreover, it is shown that the absorbance of the graphene layer at the low photon energies doesn’t noticeably depend on the tension direction, the strain modulus and the angle between the tension direction and the tangential electric field.