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P-wave Pairing Near a Spin-Split Josephson Junction
Rubén Seoane Souto1, Dushko Kuzmanovski2, Ignacio Sardinero3,4,5
1Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain.
Journal of Low Temperature Physics
|October 21, 2024
Summary
In spin-split superconductors, a Josephson junction exhibits a ground-state transition due to Andreev bound states. This transition suppresses supercurrent, indicating a shift towards p-wave pairing.
Area of Science:
- Condensed Matter Physics
- Quantum Materials
Background:
- Superconductivity and magnetism are competing phenomena that can coexist, leading to novel quantum behaviors.
- Their interplay can induce exotic electron pairing mechanisms and topological phases.
Purpose of the Study:
- Investigate the properties of a Josephson junction formed by two spin-split superconductors.
- Understand the role of Andreev bound states in the junction's behavior.
Main Methods:
- Theoretical study of a Josephson junction with spin-split superconductors.
- Analysis of Andreev bound states and their energy levels.
- Examination of pairing channels and noise spectrum.
Main Results:
- A ground-state transition occurs when an Andreev bound state crosses the Fermi level, causing a suppressed supercurrent.
- This supercurrent blockade is attributed to the dominance of p-wave pairing near the junction.
- P-wave pairing is favored with parallel magnetization and suppressed with anti-parallel magnetization.
- The noise spectrum reveals signatures of the ground-state transition via elevated zero-frequency noise.
Conclusions:
- The study reveals a novel ground-state transition in spin-split superconductor Josephson junctions.
- The findings highlight the importance of p-wave pairing in these systems.
- The results offer insights into controlling and understanding exotic quantum phenomena in hybrid superconductor systems.
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