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  • 1D proximity superconductivity

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One-dimensional proximity superconductivity in the quantum Hall regime

Research output: Contribution to Journal/MagazineJournal articlepeer-review

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  • Julien Barrier
  • Na Xin
  • Minsoo Kim
  • Roshan Krishna Kumar
  • Piranavan Kumaravadivel
  • Lee Hague
  • Ekaterina Nguyen
  • A. I. Berdyugin
  • Christian Moulsdale
  • Vladimir Enaldiev
  • Jonathan Prance
  • Frank Koppens
  • Roman Gorbachev
  • Kenji Watanabe
  • Takashi Taniguchi
  • Leonid Glazman
  • Irina Grigorieva
  • Vladimir Falko
  • Andre Geim
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<mark>Journal publication date</mark>25/04/2024
<mark>Journal</mark>Nature
Issue number8009
Volume628
Number of pages5
Pages (from-to)741-745
Publication StatusPublished
Early online date24/04/24
<mark>Original language</mark>English

Abstract

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 (1D) 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. Here we show that domain walls in minimally twisted bilayer graphene support exceptionally robust proximity superconductivity in the quantum Hall regime, allowing Josephson junctions operational in fields close to the upper critical field of superconducting electrodes. The critical current is found to be non-oscillatory, practically unchanging over the entire range of quantizing fields, with its value being limited by the quantum conductance of ballistic strictly-1D electronic channels residing within the domain walls. The described system is unique in its ability to support Andreev bound states in high fields and offers many interesting directions for further exploration.