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.
@article{arxiv.1204.4372,
title = {Intrinsic Terahertz Plasmons and Magnetoplasmons in Large Scale Monolayer Graphene},
author = {I. Crassee and M. Orlita and M. Potemski and A. L. Walter and M. Ostler and Th. Seyller and I. Gaponenko and J. Chen and A. B. Kuzmenko},
journal= {arXiv preprint arXiv:1204.4372},
year = {2012}
}