Quantum Hall transport across monolayer-bilayer boundary in graphene

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Abstract

Magnetotransport across monolayer-bilayer boundary on a graphene piece has been studied in the quantum Hall state. The edge channel transport in monolayer-bilayer junctions has been discussed based on the Landauer-Buttiker picture following p-n bipolar junctions of monolayer graphene. We considered two extreme cases of transmission from input edge channels to output channels at the junction, the maximum transmission model and the full-mixing model. They give different two-terminal conductance as a function of carrier filling. We measured the two-terminal conductance in monolayer-bilayer junction devices, and the measured conductance agreed better with the full-mixing model. This result suggests that edge channels of monolayer and bilayer regions are almost fully mixed up at the monolayer-bilayer boundary.

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Tsukuda, A., Okunaga, H., Nakahara, D., Uchida, K., Konoike, T., & Osada, T. (2011). Quantum Hall transport across monolayer-bilayer boundary in graphene. In Journal of Physics: Conference Series (Vol. 334). Institute of Physics Publishing. https://doi.org/10.1088/1742-6596/334/1/012038

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