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Supercurrent diode effect and magnetochiral anisotropy in few-layer NbSe2
Lorenz Bauriedl1, Christian Bäuml1, Lorenz Fuchs1
1Institut für Experimentelle und Angewandte Physik, University of Regensburg, Regensburg, Germany.
Nature Communications
|July 23, 2022
Summary
Researchers observed a supercurrent diode effect in NbSe2, demonstrating high rectification efficiency. This finding advances superconducting quantum electronics using van der Waals materials.
Area of Science:
- Condensed Matter Physics
- Quantum Electronics
- Materials Science
Background:
- Nonreciprocal transport involves charge transfer sensitive to bias polarity, previously studied mainly in dissipative systems.
- Recent experiments show nonreciprocal supercurrent and a supercurrent diode effect in Rashba superconductors.
Purpose of the Study:
- To report and investigate the supercurrent diode effect in NbSe2 constrictions.
- To explore the underlying mechanisms and efficiency of this effect in a new material system.
Main Methods:
- Patterning NbSe2 flakes with varying layer numbers to create constrictions.
- Measuring supercurrent transport properties under different magnetic field configurations.
Main Results:
- Observed a significant supercurrent diode effect in NbSe2 constrictions with rectification efficiency up to 60%.
- Attributed the rectification to valley-Zeeman spin-orbit interaction, driven by the out-of-plane magnetic field.
- Demonstrated field asymmetry with an additional transverse in-plane magnetic field.
Conclusions:
- NbSe2 exhibits a highly efficient supercurrent diode effect, surpassing previous reports in Rashba superconductors.
- This effect is tunable with magnetic fields, offering new design possibilities for superconducting quantum devices.
- Van der Waals materials like NbSe2 provide high integrability for advanced superconducting electronics.
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