Selective transmission of Dirac electrons and ballistic magnetoresistance of n − p junctions in graphene

We show that an electrostatically created $n\text{\ensuremath{-}}p$ junction separating the electron and hole gas regions in a graphene monolayer transmits only those quasiparticles that approach it almost perpendicularly to the $n\text{\ensuremath{-}}p$ interface. Such a selective transmission of carriers by a single $n\text{\ensuremath{-}}p$ 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 $n\text{\ensuremath{-}}p$ junctions in graphene.

• EA
  Engineering and Physical Sciences Research Council