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Loss and Decoherence at the Quantum Hall-Superconductor Interface
Lingfei Zhao1, Zubair Iftikhar1, Trevyn F Q Larson1
1Department of Physics, Duke University, Durham, North Carolina 27708, USA.
Physical Review Letters
|November 13, 2023
Summary
We studied Andreev conversion in graphene's quantum Hall regime. Electron-to-hole conversion probability showed unexpected, decoupled dependencies on temperature and magnetic field, hinting at new hybrid device possibilities.
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.
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