Intrinsic Terahertz Plasmons and Magnetoplasmons in Large Scale   Monolayer Graphene
  We show that in graphene epitaxially grown on SiC the Drude absorption is transformed into a strong terahertz plasmonic peak due to natural nanoscale inhomogeneities, such as substrate terraces and wrinkles. The excitation of the plasmon modifies dramatically the magneto-optical response and in particular the Faraday rotation. This makes graphene a unique playground for plasmon-controlled magneto-optical phenomena thanks to a cyclotron mass 2 orders of magnitude smaller than in conventional plasmonic materials such as noble metals. 
I. Crassee, M. Orlita, M. Potemski, A. L. Walter, M. Ostler, Th.   Seyller, I. Gaponenko, J. Chen, A. B. Kuzmenko
cond-mat.str-el cond-mat.mes-hall cond-mat.mtrl-sci