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- W3092384105 abstract "Detecting conductance quantization in graphene nanostructures turned out more challenging than expected. The observation of well-defined conductance plateaus through graphene nanoconstrictions so far has only been accessible in the highest quality suspended or h-BN encapsulated devices. However, reaching low conductance quanta in zero magnetic field, is a delicate task even with such ultra-high mobility devices. Here, we demonstrate a simple AFM-based nanopatterning technique for defining graphene constrictions with high precision (down to 10 nm width) and reduced edge-roughness (+/- 1 nm). The patterning process is based on the in-plane mechanical cleavage of graphene by the AFM tip, along its high symmetry crystallographic directions. As-defined, narrow graphene constrictions with improved edge quality enable an unprecedentedly robust QPC operation, allowing the observation of conductance quantization even on standard $SiO_2/Si$ substrates, down to low conductance quanta. Conductance plateaus, were observed at $ne^2/h$, evenly spaced by $2e^2/h$ (corresponding to n = 3, 5, 7, 9, 11) in the absence of an external magnetic field, while spaced by $e^2/h$ (n = 1, 2, 3, 4, 5, 6) in 8T magnetic field." @default.
- W3092384105 created "2020-10-15" @default.
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- W3092384105 date "2020-10-08" @default.
- W3092384105 modified "2023-09-26" @default.
- W3092384105 title "Robust quantum point contact operation of narrow graphene constrictions patterned by AFM cleavage lithography" @default.
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- W3092384105 doi "https://doi.org/10.48550/arxiv.2010.04066" @default.
- W3092384105 hasPublicationYear "2020" @default.
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