Edge mixing dynamics in graphene p–n junctions in the quantum Hall regime

Sadashige Matsuo (), Shunpei Takeshita, Takahiro Tanaka, Shu Nakaharai, Kazuhito Tsukagoshi, Takahiro Moriyama, Teruo Ono and Kensuke Kobayashi ()
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Sadashige Matsuo: Osaka University, Toyonaka
Shunpei Takeshita: Osaka University, Toyonaka
Takahiro Tanaka: Osaka University, Toyonaka
Shu Nakaharai: WPI-MANA, NIMS
Kazuhito Tsukagoshi: WPI-MANA, NIMS
Takahiro Moriyama: Institute for Chemical Research, Kyoto University
Teruo Ono: Institute for Chemical Research, Kyoto University
Kensuke Kobayashi: Osaka University, Toyonaka

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract Massless Dirac electron systems such as graphene exhibit a distinct half-integer quantum Hall effect, and in the bipolar transport regime co-propagating edge states along the p–n junction are realized. Additionally, these edge states are uniformly mixed at the junction, which makes it a unique structure to partition electrons in these edge states. Although many experimental works have addressed this issue, the microscopic dynamics of electron partition in this peculiar structure remains unclear. Here we performed shot-noise measurements on the junction in the quantum Hall regime as well as at zero magnetic field. We found that, in sharp contrast with the zero-field case, the shot noise in the quantum Hall regime is finite in the bipolar regime, but is strongly suppressed in the unipolar regime. Our observation is consistent with the theoretical prediction and gives microscopic evidence that the edge states are uniquely mixed along the p–n junction.

Date: 2015
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DOI: 10.1038/ncomms9066

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