We show that an electrostatically created $n\text{−}p$ junction separating the electron and hole gas regions in a graphene monolayer transmits only those quasiparticles that approach it almost perpendicularly to the $n\text{−}p$ interface. Such a selective transmission of carriers by a single $n\text{−}p$ junction would manifest itself in nonlocal magnetoresistance effect in arrays of such junctions and determines the unusual Fano factor in the current noise universal for the $n\text{−}p$ junctions in graphene.

• Received 23 March 2006

DOI:https://doi.org/10.1103/PhysRevB.74.041403