One-dimensional transport along graphene domain walls

  • Datum: 21.02.2025
  • Uhrzeit: 10:30 - 11:30
  • Vortragende(r): J. Barrier
  • ICFO – The Institute of Photonic Science, Castelldefels, Spain
  • Ort: Max Planck Institute for Solid State Research
  • Raum: 1W48
  • Gastgeber: Research Group Solid State Nanophysics
One-dimensional transport along graphene domain walls

Extensive efforts have been undertaken to combine superconductivity and the quantum Hall effect so that Cooper-pair transport between superconducting electrodes in Josephson junctions is mediated by one-dimensional edge states. This interest has been motivated by prospects of finding new physics, including topologically-protected quasiparticles, but also extends into metrology and device applications. So far it has proven challenging to achieve detectable supercurrents through quantum Hall conductors. I will show that domain walls in minimally twisted bilayer graphene support exceptionally robust proximity superconductivity in the quantum Hall regime, allowing Josephson junctions to operate in fields close to the upper critical field of superconducting electrodes. The critical current is found to be non-oscillatory and practically unchanging over the entire range of quantising fields, with its value being limited by the quantum conductance of ballistic, strictly one-dimensional electronic channels residing within the domain walls. The system presented offers several directions for further exploration.

J. Barrier et al, Nature 628, 741-745 (2024)

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