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Non-hermitian topology in multiterminal superconducting junctions

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2024

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Recent experimental advancements in dissipation control have yielded significant insights into non-hermitian Hamiltonians for open quantum systems. Of particular interest are the topological characteristics exhibited by these non-hermitian systems, that arise from exceptional points - distinct degeneracies unique to such systems. In this study, we focus on Andreev bound states in multiterminal Josephson junctions with non-hermiticity induced by normal metal or ferromagnetic leads. By investigating several systems of different synthetic dimensions and symmetries, we predict fragile and stable non-hermitian topological phases in these engineered superconducting systems.

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530 Physik

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Mesoscale and Nanoscale Physics, Superconductivity, Andreev bound states, Josephson junctions

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ISO 690OHNMACHT, David, Valentin WILHELM, Hannes WEISBRICH, Wolfgang BELZIG, 2024. Non-hermitian topology in multiterminal superconducting junctions
BibTex
@unpublished{Ohnmacht2024-08-02Nonhe-71285,
  year={2024},
  doi={10.48550/arXiv.2408.01289},
  title={Non-hermitian topology in multiterminal superconducting junctions},
  author={Ohnmacht, David and Wilhelm, Valentin and Weisbrich, Hannes and Belzig, Wolfgang}
}
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