We study the tunneling of chiral electrons in graphene through a region where the electronic spectrum changes from the usual linear dispersion to a hyperbolic dispersion, due to the presence of a gap. It is shown that contrary to the tunneling through a potential barrier, the transmission of electrons is, in this case, smaller than one for normal incidence. This mechanism may be useful for designing electronic devices made of graphene.
@article{arxiv.0805.2062,
title = {Tunneling of Dirac electrons through spatial regions of finite mass},
author = {J. Viana Gomes and N. M. R. Peres},
journal= {arXiv preprint arXiv:0805.2062},
year = {2008}
}