title: Scaling of the energy gap in pattern-hydrogenated graphene.
abstract: Recent experiments show that a substantial energy gap in graphene can be induced via patterned hydrogenation on an iridium substrate. Here, we show that the energy gap is roughly proportional to N(H)(1/2)/N(C) when disorder is accounted for, where N(H) and N(C) denote concentrations of hydrogen and carbon atoms, respectively. The dispersion relation, obtained through calculation of the momentum-energy resolved density of states, is shown to agree with previous angle-resolved photoemission spectroscopy results. Simulations of electronic transport in finite size samples also reveal a similar transport gap, up to 1 eV within experimentally achievable N(H)(1/2)/N(C) values.
authors: School of Electrical & Computer Engineering, Purdue University, West Lafayette, Indiana 47906, United States. rgrassi@arces.unibo.it
authors: Roberto
authors: R
authors: Grassi
authors: Tony
authors: T
authors: Low
authors: Mark
authors: M
authors: Lundstrom
mesh_terms: D003198:Computer Simulation; D004735:Energy Transfer; D006108:Graphite / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D008956:Models, Chemical
chemical_list: D006108:Graphite; D006859:Hydrogen