Pseudo-diffusive magnetotransport in graphene

Details Pseudo-diffusive magnetotransport in graphene Pseudo-diffusive magnetotransport in graphene

2006-11-07

arxiv.org/abs/cond-mat/0611189v3

Phys. Rev. B, 75, 113407 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4+ pages, 2 figures. Minor corrections. Published version.

Scientific paper

10.1103/PhysRevB.75.113407

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 normal-graphene-superconductor junctions. This pseudo-diffusive regime is however extremely fragile 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, pseudo-diffusive transport is recovered away from the Dirac point in resonance with Landau levels at high magnetic fields.

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