A new, weakly damped, {\em transverse} electromagnetic mode is predicted in graphene. The mode frequency ω lies in the window 1.667<ℏω/μ<2, where μ is the chemical potential, and can be tuned from radiowaves to the infrared by changing the density of charge carriers through a gate voltage.
@article{arxiv.cond-mat/0703406,
title = {A new electromagnetic mode in graphene},
author = {S. A. Mikhailov and K. Ziegler},
journal= {arXiv preprint arXiv:cond-mat/0703406},
year = {2007}
}