We reveal that there exists a class of graphene structures (a sub-class of bilayer graphene nanoribbons) which has unusually strong optical response in the terahertz (THz) and far infrared (FIR) regime. The peak conductance of terahertz/FIR active bilayer ribbons is around two orders of magnitude higher than the universal conductance of e2/4ℏ observed in graphene sheets. The criterion for the terahertz/FIR active sub-class is a bilayer graphene nanoribbon with one-dimensional massless Dirac Fermion energy dispersion near the Γ point. Our results overcome a significant obstacle that hinders potential application of graphene in electronics and photonics.
@article{arxiv.0905.4304,
title = {Strong terahertz response in bilayer graphene nanoribbons},
author = {A. R. Wright and J. C. Cao and C. Zhang},
journal= {arXiv preprint arXiv:0905.4304},
year = {2009}
}