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φ Josephson Junction Induced by Altermagnetism
Bo Lu1, Kazuki Maeda2, Hiroyuki Ito2
1Center for Joint Quantum Studies, Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Department of Physics, <a href="https://ror.org/012tb2g32">Tianjin University</a>, Tianjin 300072, China.
Physical Review Letters
|December 13, 2024
Summary
We investigated the Josephson effect in superconductor-altermagnet-superconductor junctions, observing anomalous phenomena like 0-π transitions. These junctions exhibit tunable properties, offering potential for novel functionalities in superconducting devices.
Area of Science:
- Condensed Matter Physics
- Superconductivity
- Spintronics
Background:
- The Josephson effect describes quantum mechanical tunneling between superconductors.
- Altermagnets are a novel class of magnetic materials with unique electronic properties.
- Superconductor-altermagnet-superconductor (S-AM-S) junctions are emerging platforms for exploring exotic phenomena.
Purpose of the Study:
- To investigate the Josephson effect in superconductor-altermagnet-superconductor junctions.
- To identify and characterize anomalous phenomena within these junctions.
- To explore the tunability and potential functionalities of S-AM-S systems.
Main Methods:
- Theoretical modeling of the Josephson effect in S-AM-S junctions.
- Analysis of current-phase relationships.
- Investigation of phase transitions and energy minima.
Main Results:
- Observed anomalous phenomena including 0-π transitions.
- Identified multinodal current-phase relations.
- Demonstrated that d-wave altermagnets can support $\phi$ junctions with double degeneracy.
- Showcased tunability of junction properties via exchange energy, crystal orientation, length, and doping.
Conclusions:
- S-AM-S junctions exhibit rich and tunable properties.
- The observed phenomena suggest accessible functionalities for advanced superconducting devices.
- These findings open new avenues for research in hybrid superconducting systems.
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