Check the following paper for details:
- Vakil, A. & Engheta, N. Transformation Optics Using Graphene. Science 332, 1291-1294 (2011)
- Li, Z. Q. et al. Dirac charge dynamics in graphene by infrared spectroscopy. Nat Phys 4, 532-535 (2008).
- Gusynin, V. P., Sharapov, S. G. & Carbotte, J. P. Unusual microwave response of Dirac quasiparticles in graphene. Phys Rev Lett 96 (2006).