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Supercurrent in the quantum Hall regime.

F Amet1, C T Ke2, I V Borzenets3

  • 1Department of Physics, Duke University, Durham, NC 27708, USA. Department of Physics and Astronomy, Appalachian State University, Boone, NC 28607, USA. ametf@appstate.edu gleb@phy.duke.edu.

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Researchers observed a supercurrent in the quantum Hall (QH) regime by combining superconductivity and the QH effect in graphene. This breakthrough advances the search for exotic topological excitations like Majorana fermions for quantum computing.

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Area of Science:

  • Condensed matter physics
  • Quantum phenomena

Background:

  • Combining superconductivity and the quantum Hall (QH) effect offers a route to topological states.
  • Observing superconductivity signatures in the QH regime and supercurrents in QH weak links remains challenging.

Purpose of the Study:

  • To demonstrate a supercurrent mechanism within the quantum Hall regime.
  • To advance the search for exotic topological excitations.

Main Methods:

  • Utilized encapsulated graphene samples.
  • Contacted samples with superconducting electrodes.
  • Applied magnetic fields up to 2 tesla.

Main Results:

  • Successfully demonstrated a distinct supercurrent in encapsulated graphene within the QH regime.
  • Observed this supercurrent in magnetic fields up to 2 tesla.

Conclusions:

  • The observation of a supercurrent in the QH regime is a significant step.
  • This finding aids the quest for Majorana fermions and parafermions for fault-tolerant quantum computing.