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Quasi-one-dimensional transport in graphene under a magnetic field

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Abstract

Examining the potential of monolayer graphene in quantum information processing, this study investigates electron transport characteristics of a ballistic graphene device featuring a quantum point contact (QPC) in a split-gate geometry for Quantum Hall (QH) interferometry. Utilizing the QPC in a split-gate geometry, we demonstrate robust control over electron transport, allowing selective transmission and reflection. Our experimental study involves careful examination of quantized conductance in a four-terminal geometry under varying magnetic fields and gate voltage, confirming the effectiveness of the QPC as an electron beam splitter. The experiment reveals quantized conductance steps in steps of \(4{e}^{2}/h\) in the absence and presence of a magnetic field, emphasizing stability of our quasi-1D transport channels. The tunable transmission probabilities of the QPC offer a versatile tool for manipulating electron transport, providing valuable insights for controlled quantum interferometric setups. The findings lay a foundation for future advancements in quantum information processing, opening avenues for topologically protected quantum computation.

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Acknowledgements

This work was supported by the Kyung Hee University Research Grant in 2021 (KH-20211886) and National Research Foundation of Korea (NRF) grant [funded by the Korean government (MSIT), NRF- 2022R1C1C1003443].

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  1. Department of Applied Physics, Integrated Education Institute for Frontier Science and Technology (BK21 Four) and Institute of Natural Sciences, Kyung Hee University, Yong-in, 17104, South Korea

    Minsoo Kim

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Kim, M. Quasi-one-dimensional transport in graphene under a magnetic field. J. Korean Phys. Soc. 84, 703–707 (2024). https://doi.org/10.1007/s40042-024-01029-3

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