Observation of Quantum Hall Plateau-Plateau Transition and Scaling Behavior of the Zeroth Landau Level in Graphene p-n-p Junction

Electrical transport studies of graphene heterostructures (Young and Kim in Ann Rev Conden Ma P 2:101 [1]) have revealed the quantum Hall effect (QHE) (Ozyilmaz et al. in Phys Rev Lett 99:166804 [2]), quantum interference behaviors (Young and Kim in Nat Phys 5:222; [3]; Satoru et al. in Jpn J Appl Phys 52:110105 [4]), Klein tunneling (Katsnelson et al. in Nat Phys 2:620 [5]; Shytov et al. in Phys Rev Lett 101:156804 [6]), and the split closed-loop resonator (Zheng et al. in Nat Nanotechnol 8:119 [7]), hence convincingly demonstrating the advantages of constructing in-plane heterostructures of graphene.