We calculate the dispersion equations for magnetoplasmons in a single layer, a pair of parallel layers, a graphite bilayer and a superlattice of graphene layers in a perpendicular magnetic field. We demonstrate the feasibility of a drift-induced instability of magnetoplasmons. The magnetoplasmon instability in a superlattice is enhanced compared to a single graphene layer. The energies of the unstable magnetoplasmons could be in the terahertz (THz) part of the electromagnetic spectrum. The enhanced instability makes superlattice graphene a potential source of THz radiation.
@article{arxiv.0808.3128,
title = {Magnetoplasmons in layered graphene structures},
author = {Oleg L. Berman and Godfrey Gumbs and Yurii E. Lozovik},
journal= {arXiv preprint arXiv:0808.3128},
year = {2009}
}