Past Seminars Seminários Já Decorridos 2008

Bilayer graphene as variable gap semiconductor and its transparency to visible light

By: Nuno M. R. Peres
From: Department of Physics, University of Minho, Braga, Portugal
At: Complexo Interdisciplinar, Anfiteatro
[2008-10-29] 12:00

We present a discussion of some of the physical properties of graphene and its bilayer. In particular, we focus our attention on the calculation of the transparency of graphene and on the dependence of the energy gap of the biased graphene bilayer on the electronic density. We show that the transparency of graphene is controlled by the value of the fine structure constant over a frequency range from the infra-red to the ultraviolet. We derive the dependence of the energy gap of the graphene bilayer on the external applied electric field.

1. A. H. Castro Neto, F. Guinea, N. M. R. Peres, K. S. Novoselov, and A. K. Geim, accepted for publication in Review of Modern Physics; arXiv:0709.1163v2.