Shot noise generated by graphene p-n junctions in the quantum Hall effect regime

Nature Communications
N KumadaP Roulleau

Abstract

Graphene offers a unique system to investigate transport of Dirac Fermions at p-n junctions. In a magnetic field, combination of quantum Hall physics and the characteristic transport across p-n junctions leads to a fractionally quantized conductance associated with the mixing of electron-like and hole-like modes and their subsequent partitioning. The mixing and partitioning suggest that a p-n junction could be used as an electronic beam splitter. Here we report the shot noise study of the mode-mixing process and demonstrate the crucial role of the p-n junction length. For short p-n junctions, the amplitude of the noise is consistent with an electronic beam-splitter behaviour, whereas, for longer p-n junctions, it is reduced by the energy relaxation. Remarkably, the relaxation length is much larger than typical size of mesoscopic devices, encouraging using graphene for electron quantum optics and quantum information processing.

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Citations

Jul 29, 2016·Scientific Reports·E S TikhonovV S Khrapai
Oct 31, 2018·Nanotechnology·Chengyi TianYu Wang
Jan 1, 2018·Physical Review. B·Jiuning HuDavid B Newell
Apr 14, 2020·Physical Review Letters·Raphael KozlovskyCosimo Gorini
Aug 25, 2020·Journal of Physics D: Applied Physics·Chieh-I LiuAlbert F Rigosi
Jul 17, 2019·Science Advances·Saurabh Kumar SrivastavAnindya Das

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