Year: 2009
Type: article
Abstract: We present evidence, from lattice Monte Carlo simulations of the phase diagram of graphene as a function of the Coulomb coupling between quasiparticles, that graphene in vacuum is likely to be an insulator. We find a semimetal-insulator transition at alpha_{g};{crit}=1.11+/-0.06, where alpha_{g} approximately 2.16 in vacuum, and alpha_{g} approximately 0.79 on a SiO2 substrate. Our analysis uses the logarithmic derivative of the order parameter, supplemented by an equation of state. The insulating phase disappears above a critical number of four-component fermion flavors 4<N_{f};{crit}<6. Our data are consistent with a second-order transition.
Source: Physical Review Letters
Authors: Joaquín E. Drut, Timo A. Lähde
Institutions: The Ohio State University, University of Washington
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Awards: INSTITUTE FOR NUCLEAR THEORY, G1286236842, G1863003419, G222768804, INSTITUTE FOR NUCLEAR THEORY, G3083819904, G42916606, Research in Strong-Interaction Theory, LOW ENERGY NUCLEAR PHYSICS NATIONAL HPC INITIATIVE: BUILDING A UNIVERSAL NUCLEAR ENERGY DENSITY FUNCTIONAL, LOW-ENERGY NUCLEAR PHYSICS NATIONAL HPC INITIATIVE: BLDG. A UNIVERSAL NUCLEAR ENERGY DENSITY FUN, G969889393
OpenAlex ID: W2071708819