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Published on: January 21, 2016
Parity effect of bipolar quantum Hall edge transport around graphene antidots
Sadashige Matsuo1, Shu Nakaharai2, Katsuyoshi Komatsu2
11] Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan [2] Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan.
Abstract:
Parity effect, which means that even-odd property of an integer physical parameter results in an essential difference, ubiquitously appears and enables us to grasp its physical essence as the microscopic mechanism is less significant in coarse graining. Here we report a new parity effect of quantum Hall edge transport in graphene antidot devices with pn junctions (PNJs). We found and experimentally verified that the bipolar quantum Hall edge transport is drastically affected by the parity of the number of PNJs. This parity effect is universal in bipolar quantum Hall edge transport of not only graphene but also massless Dirac electron systems. These results offer a promising way to design electron interferometers in graphene.
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