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Broad and colossal edge supercurrent in Dirac semimetal Cd3As2 Josephson junctions
Chun-Guang Chu1, Jing-Jing Chen2,3, An-Qi Wang4
1State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, 100871, Beijing, China.
Nature Communications
|October 3, 2023
Summary
Researchers observed a broad edge supercurrent in Dirac semimetal Josephson junctions, suggesting a non-Hermitian skin effect. This finding could advance topological superconducting states and exotic topological matter.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Edge supercurrent is key for topological superconducting states.
- Non-Hermitian skin effect causes abnormal edge channels.
Purpose of the Study:
- Observe broad edge supercurrent in Dirac semimetal Josephson junctions.
- Investigate the role of non-Hermiticity in edge supercurrent.
Main Methods:
- Fabrication of Cd3As2-based Josephson junctions.
- Measurement of superconducting quantum interference at 10 mK.
Main Results:
- Observed broad edge supercurrent (~1.6 μm width, ~1 μA magnitude).
- Indicated presence of non-Hermitian skin effect due to electron-doped Cd3As2.
- Observed supercurrent nonlocality.
Conclusions:
- Broad edge supercurrent suggests non-Hermitian skin effect in Dirac semimetals.
- Interplay of band topology and non-Hermiticity is crucial for exotic topological matter exploitation.
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