Figure 1: Edge states in the unipolar and bipolar regimes.
From: Edge mixing dynamics in graphene p–n junctions in the quantum Hall regime
(a) Behaviour of the QH edge states at a junction is schematically shown for the conventional 2DEG case or for the unipolar graphene case. The edge state in the left region and right region circulates in the same direction. (b) Behaviour of the QH edge states in the bipolar graphene junction. The edges counter-circulate in the n and p regions and co-propagate along the junction10. The shot noise reveals how the edges mix along the junction.
