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Supercurrent and multiple Andreev reflections in micrometer-long ballistic graphene Josephson junctions.
Mengjian Zhu1, Moshe Ben Shalom, Artem Mishchsenko
1School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK. mengjian.zhu@outlook.com.
We demonstrate high-quality ballistic Josephson junctions using superconductor-graphene-superconductor structures. These junctions exhibit enhanced critical current density and Andreev reflections, advancing quantum transport studies.
Area of Science:
- Condensed Matter Physics
- Quantum Transport Phenomena
- Materials Science
Background:
- Ballistic Josephson junctions are crucial for exploring exotic quantum phenomena.
- Superconductor-graphene interfaces offer unique properties for electronic devices.
- Previous research faced limitations in junction quality and performance.
Purpose of the Study:
- To fabricate and characterize high-quality ballistic superconductor-graphene-superconductor Josephson junctions.
- To investigate the transport properties and Andreev reflections in these novel junctions.
- To validate theoretical predictions for ballistic Josephson junctions.
Main Methods:
- Fabrication of superconductor-graphene-superconductor junctions using niobium and hexagonal boron nitride encapsulated graphene.
- Electrical transport measurements, including critical current density and differential resistance.
- Analysis of Fabry-Pérot oscillations, Sharvin resistance, and Andreev reflections.
Main Results:
- Achieved micrometer-long ballistic graphene Josephson junctions with record-low contact resistance.
- Observed critical current density over an order of magnitude higher than previous reports.
- Demonstrated Andreev reflections up to the third order and verified ballistic transport characteristics.
- ICRN product showed independence from carrier density, aligning with theoretical models.
Conclusions:
- High-quality ballistic Josephson junctions in graphene are feasible with advanced fabrication techniques.
- These junctions exhibit superior performance, paving the way for new quantum devices.
- The results confirm the theoretical framework for ballistic Josephson junctions and open avenues for further research.
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