AI Article Synopsis
- Superconductivity and magnetism can compete yet coexist, resulting in unique behaviors such as exotic electron pairing and topological phases.
- This study focuses on a Josephson junction made of two spin-split superconductors, where the spin-splitting is influenced by a ferromagnetic material or an external magnetic field.
- The findings reveal that Andreev bound states impact the junction's properties, leading to a ground-state transition that suppresses the supercurrent, particularly emphasizing the role of p-wave pairing when magnetizations of the superconductors are aligned.
Article Abstract
Superconductivity and magnetism are competing effects that can coexist in certain regimes. Their co-existence leads to unexpected new behaviors that include the onset of exotic electron pair mechanisms and topological phases. In this work, we study the properties of a Josephson junction between two spin-split superconductors. The spin-splitting in the superconductors can arise from either the coupling to a ferromagnetic material or an external magnetic field. The properties of the junction are dominated by the Andreev bound states that are also split. One of these states can cross the superconductor's Fermi level, leading to a ground-state transition characterized by a suppressed supercurrent. We interpret the supercurrent blockade as coming from a dominance of p-wave pairing close to the junction, where the electrons are at both sides. To support this interpretation, we analyze the different pairing channels and show that p-wave pairing is favored in the case where the magnetization of the two superconductors is parallel and suppressed in the anti-parallel case. We also analyze the noise spectrum that shows signatures of the ground-state transition in the form of an elevated zero-frequency noise.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11486825 | PMC |
| http://dx.doi.org/10.1007/s10909-024-03176-0 | DOI Listing |
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- This study focuses on a Josephson junction made of two spin-split superconductors, where the spin-splitting is influenced by a ferromagnetic material or an external magnetic field.
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