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

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 \(4{e}^{2}/h\) $4e^2/h$ 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.