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

Nature Communications
Sadashige MatsuoKensuke Kobayashi

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.

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Citations

Jul 29, 2016·Scientific Reports·E S TikhonovV S Khrapai
Aug 2, 2016·Proceedings of the Japan Academy. Series B, Physical and Biological Sciences·Kensuke Kobayashi
Jul 17, 2019·Science Advances·Saurabh Kumar SrivastavAnindya Das
Aug 25, 2020·Journal of Physics D: Applied Physics·Chieh-I LiuAlbert F Rigosi
Feb 27, 2018·Physical Review Letters·Jing LiJun Zhu

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Methods Mentioned

BETA
electron-beam lithography

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