Transformation Optics scheme for two-dimensional materials
  Two dimensional optical materials, such as graphene can be characterized by a surface conductivity. So far, the transformation optics schemes have focused on three dimensional properties such as permittivity $\epsilon$ and permeability $\mu$. In this paper, we use a scheme for transforming surface currents to highlight that the surface conductivity transforms in a way different from $\epsilon$ and $\mu$. We use this surface conductivity transformation to demonstrate an example problem of reducing scattering of plasmon mode from sharp protrusions in graphene. 
Anshuman Kumar, Kin Hung Fung, M. T. Homer Reid and Nicholas Fang
physics.optics cond-mat.mes-hall