title: Veselago lens and Klein collimator in disordered graphene.
abstract: We simulate electron transport through graphene nanoribbons of realistic size containing a p-n junction patterned by electrostatic gates. For a sharp p-n interface, Klein tunneling leads to refocusing of a divergent beam forming a Veselago lens. Wider transition regions allow only electrons with near-perpendicular incidence to pass the junction, forming a Klein collimator. Using a third nearest neighbor tight binding description we explore the influence of interface roughness and bulk disorder on guiding properties. We provide bounds on disorder amplitudes and p-n junction properties to be satisfied in order to experimentally observe the focusing effect and compare our predictions to very recent realizations.
authors.forename: F
authors.initials: F
authors.lastname: Libisch
authors.forename: T
authors.initials: T
authors.lastname: Hisch
authors.forename: R
authors.initials: R
authors.lastname: Glattauer
authors.forename: L A
authors.initials: LA
authors.lastname: Chizhova
authors.forename: J
authors.initials: J
authors.lastname: Burgdörfer