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By using four-terminal configurations, we investigated the dependence oflongitudinal and diagonal resistances of a graphene p-n interface on thequantum-Hall edge-state equilibration position. The resistance of a p-n devicein our four-terminal scheme is asymmetric with respect to the zero point wherethe filling factor ($\nu$) of the entire graphene vanishes. This resistanceasymmetry is caused by the chiral-direction-dependent change of theequilibration position and leads to a deeper insight into the equilibrationprocess of the quantum-Hall edge states in a bipolar graphene system.

Dependence of quantum-Hall conductance on the edge-state equilibration position in a bipolar graphene sheet