Characterization of the size and position of electronhole puddles at a graphene pn junctionCharacterization of the size and position of electronhole puddles at a graphene pn junction
Faculty of Sciences. Physics
Condensed Matter Theory
Engineering sciences. Technology
Nanotechnology. - Bristol
27(2016):10, 6 p.
University of Antwerp
The effect of an electronhole puddle on the electrical transport when governed by snake states in a bipolar graphene structure is investigated. Using numerical simulations we show that information on the size and position of the electronhole puddle can be obtained using the dependence of the conductance on magnetic field and electron density of the gated region. The presence of the scatterer disrupts snake state transport which alters the conduction pattern. We obtain a simple analytical formula that connects the position of the electronhole puddle with features observed in the conductance. The size of the electronhole puddle is estimated from the magnetic field and gate potential that maximizes the effect of the puddle on the electrical transport.