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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Superconductor-graphene interfaces are crucial for novel electronic devices.
  • The quantum Hall (QH) regime in graphene offers unique electronic properties.

Purpose of the Study:

  • To systematically investigate Andreev conversion at superconductor-graphene interfaces in the QH regime.
  • To understand the influence of temperature and magnetic field on this conversion process.

Main Methods:

  • Experimental study of Andreev conversion.
  • Analysis of electron-to-hole conversion probability.
  • Investigation of temperature and magnetic field dependencies.

Main Results:

  • Observed a clear, unexpected trend in Andreev conversion probability.
  • Found nearly decoupled dependencies on temperature and magnetic field.
  • Identified the role of superconducting vortices and their normal cores in electron absorption and dephasing.

Conclusions:

  • The findings challenge existing models and offer new insights into superconductor-graphene interactions.
  • This research may enable the development of future hybrid devices leveraging superconductivity in chiral channels.