New Electromagnetic Mode in Graphene

A new, weakly damped, transverse electromagnetic mode is predicted in graphene. The mode frequency $\ensuremath{\omega}$ lies in the window $1.667<\ensuremath{\hbar}\ensuremath{\omega}/\ensuremath{\mu}<2$, where $\ensuremath{\mu}$ is the chemical potential, and can be tuned from radio waves to the infrared by changing the density of charge carriers through a gate voltage.