title: New Dirac fermions in periodically modulated bilayer graphene.
abstract: We investigate the effect of periodic potentials on the electronic structure of bilayer graphene and show that there is a critical value of the external potential below which new Dirac fermions are generated in the low-energy band structure, and above which a band gap is opened in the system. Our results, obtained from a self-consistent tight-binding calculation, can be simply explained by a two-band continuum model as a consequence of the pseudospin physics in graphene. The findings are robust against changes in the form of the potential, as well as bias voltages between the layers.
authors.affiliation: Department of Physics, University of California, Berkeley, California 94720, United States.
authors.forename: Liang Z
authors.initials: LZ
authors.lastname: Tan
authors.forename: Cheol-Hwan
authors.initials: CH
authors.lastname: Park
authors.forename: Steven G
authors.initials: SG
authors.lastname: Louie
mesh_terms: D004583:Electrons; D006108:Graphite / Q000737:chemistry*; D036103:Nanotechnology; D011789:Quantum Theory
chemical_list: D006108:Graphite