2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/164100We calculate the conductivity of a clean graphene sheet at finite temperatures starting from the tight-binding model. We obtain a finite value for the dc-conductivity at zero temperature. For finite temperature, the spontaneous electron-hole creation, responsible for the finite conductivity at zero temperature, is washed out and the dc-conductivity yields zero. Our results are in agreement with calculations based on the field-theoretical model for graphene.8 pages, 1 figureMesoscale and Nanoscale Physicstext