Pseudodiffusive magnetotransport in graphene

Transport properties through wide and short ballistic graphene junctions
are studied in the presence of
arbitrary dopings and magnetic fields. No dependence on the magnetic
field is observed at the Dirac point for
any current cumulant, just as in a classical diffusive system, both in
normal-graphene-normal and normalgraphene-
superconductor junctions. This pseudodiffusive regime is, however,
extremely fragile with respect to
doping at finite fields. We identify the crossovers to a
field-suppressed and a normal ballistic transport regime
in the magnetic-field-doping parameter space, and provide a physical
interpretation of the phase diagram.
Remarkably, pseudodiffusive transport is recovered away from the Dirac
point in resonance with Landau levels
at high magnetic fields.