Pseudo-diffusive to ballistic magnetotransport crossover in graphene
Transport properties through wide and short ballistic graphene junctions are studied in the presence of magnetic fields of arbitrary magnitude and for any doping. Remarkably, no dependence of the magnetic field is observed at the Dirac point for any current cumulant, just as in a classical (many channel) diffusive system, both in normal-graphene-normal and normal-graphene-superconductor junctions. This pseudo-diffusive regime however is extremely fragile respect to doping at finite fields. We identify the crossovers to a field-suppressed transport regime and to the normal ballistic transport regime in the magnetic field - doping parameter space, and provide a physical interpretation of the phase diagram and transport resonances.