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

• Published in: Journal of the Korean Physical Society Vol. 84; no. 9; pp. 703 - 707
• Main Author: Kim, Minsoo
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Physical Society 01.05.2024; Springer Nature B.V; 한국물리학회
• Subjects: Data processing; Electron beams; Electron transport; Electrons; Geometry; Graphene; Information processing; Interferometry; Magnetic fields; Mathematical and Computational Physics; Original Paper - Condensed Matter; Particle and Nuclear Physics; Physics; Physics and Astronomy; Point contact; Quantum computing; Quantum phenomena; Robust control; Theoretical; Transport properties; 물리학; Quantum Hall effect; Quantum point contact; Electron transport; Graphene
• ISSN: 0374-4884; 1976-8524
• DOI: 10.1007/s40042-024-01029-3

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.