2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/139334We show how the trigonal warping effect in doped graphene can be used to produce fully valley polarized currents. We propose a device that acts both as a beam splitter and a collimator of these electronic currents. The result is demonstrated trough an optical analogy using two dimensional photonic crystals.4 pages, 5 figuresMesoscale and Nanoscale Physicstext