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Double Exchange Model at Low Densities: Magnetic Polarons and Coulomb Suppressed Phase Separation
Vitor M. Pereira, J. M. B. Lopes dos Santos, Antonio H. Castro Neto
We consider the double exchange model at very low densities. The conditions for the formation of self-trapped magnetic polarons are analyzed using an independent polaron model. The…
Origin of the energy bandgap in epitaxial graphene
S. Y. Zhou, D. A. Siegel, A. V. Fedorov +4
We studied the effect of quantum confinement on the size of the band gap in single layer epitaxial graphene. Samples with different graphene terrace sizes are studied by using low…
Supercritical Coulomb Impurities in Gapped Graphene
Vitor M. Pereira, Valeri N. Kotov, A. H. Castro Neto
We study the problem of Coulomb field-induced charging of the ground state in a system of 2D massive Dirac particles (gapped graphene). As in its 3D QED counterpart, the critical C…
Localized Magnetic States in Graphene
Bruno Uchoa, Valeri N. Kotov, N. M. R. Peres +1
We examine the conditions necessary for the presence of localized magnetic moments on adatoms with inner shell electrons in graphene. We show that the low density of states at the…
Electronic properties of bilayer and multilayer graphene
Johan Nilsson, A. H. Castro Neto, F. Guinea +1
We study the effects of site dilution disorder on the electronic properties in graphene multilayers, in particular the bilayer and the infinite stack. The simplicity of the model a…