title: Magnetism and Interaction-Induced Gap Opening in Graphene with Vacancies or Hydrogen Adatoms: Quantum Monte Carlo Study.
abstract: We study the electronic properties of graphene with a finite concentration of vacancies or other resonant scatterers by a straightforward lattice quantum Monte Carlo calculation. Taking into account a realistic long-range Coulomb interaction, we calculate the distribution of the spin density associated with midgap states and demonstrate antiferromagnetic ordering. An energy gap is open due to interaction effects, both in the bare graphene spectrum and in the vacancy or impurity bands. In the case of a 5% concentration of resonant scatterers the latter gap is estimated to be 0.7 eV and 1.1 eV for graphene on boron nitride and freely suspended graphene, respectively.
authors.affiliation: Institute of Theoretical Physics, University of Regensburg, Universitatsstrasse 31, D-93053 Regensburg, Germany.|Institute for Theoretical Problems of Microphysics, Moscow State University, Moscow 119899, Russia.|ITEP, B. Cheremushkinskaya street 25, Moscow 117218, Russia.
authors.forename: M V
authors.initials: MV
authors.lastname: Ulybyshev
authors.affiliation: Radboud University, Institute for Molecules and Materials, Heyndaalseweg 135, NL-6525AJ Nijmegen, The Netherlands.|Theoretical Physics and Applied Mathematics Department, Ural Federal University, Mira str. 19, Ekaterinburg 620002, Russia.
authors.forename: M I
authors.initials: MI
authors.lastname: Katsnelson