2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/161878Graphene on a substrate has been shown to exhibit a transition, depending on the substrate material, from a zero-gap semiconductor state to a semimetallic state. The ground-state energy of the electron (hole) gas has been calculated within the random-phase approximation.6 pages, 4 figuresOther Condensed MatterMaterials Sciencetext