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One-dimensional proximity superconductivity in the quantum Hall regime.

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Domain walls in twisted bilayer graphene enable robust superconductivity in the quantum Hall regime. This breakthrough allows for Josephson junctions with non-oscillatory critical currents, limited by one-dimensional electronic channels.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials

Background:

  • Combining superconductivity and the quantum Hall effect is challenging.
  • Superconducting Cooper-pair transport via edge states is key for new physics and applications.
  • Previous attempts to achieve supercurrents through quantum Hall conductors have faced difficulties.

Purpose of the Study:

  • To investigate the potential of domain walls in minimally twisted bilayer graphene for robust superconductivity.
  • To explore Josephson junctions operating in the quantum Hall regime.
  • To understand the nature of Cooper-pair transport and its limitations in these systems.

Main Methods:

  • Fabrication of Josephson junctions using domain walls in minimally twisted bilayer graphene.
  • Measurement of critical current in the quantum Hall regime under varying magnetic fields.
  • Analysis of the quantum conductance of one-dimensional electronic channels within domain walls.

Main Results:

  • Domain walls exhibit robust proximity superconductivity in the quantum Hall regime.
  • Josephson junctions operate close to the superconducting electrodes' upper critical field.
  • Critical current is non-oscillatory and limited by the quantum conductance of 1D channels.
  • Andreev bound states are supported at quantizing fields.

Conclusions:

  • Minimally twisted bilayer graphene domain walls offer a unique platform for combining superconductivity and the quantum Hall effect.
  • The observed robust supercurrents and unique electronic properties open new avenues for fundamental research and device applications.
  • This system provides a novel approach to studying topologically protected phenomena and quantum transport.