Evidence for Klein tunneling in graphene p-n junctions

Phys Rev Lett. 2009 Jan 16;102(2):026807. doi: 10.1103/PhysRevLett.102.026807. Epub 2009 Jan 16.


Transport through potential barriers in graphene is investigated using a set of metallic gates capacitively coupled to graphene to modulate the potential landscape. When a gate-induced potential step is steep enough, disorder becomes less important and the resistance across the step is in quantitative agreement with predictions of Klein tunneling of Dirac fermions up to a small correction. We also perform magnetoresistance measurements at low magnetic fields and compare them to recent predictions.