Non-Hermitian Topology in Multiterminal Superconducting Junctions

David Christian Ohnmacht; Valentin Wilhelm; Hannes Weisbrich; Wolfgang Belzig

doi:10.1103/PhysRevLett.134.156601

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Non-Hermitian Topology in Multiterminal Superconducting Junctions

David Christian Ohnmacht, Valentin Wilhelm, Hannes Weisbrich, Wolfgang Belzig

DOI 10.1103/PhysRevLett.134.156601 · Physical Review Letters

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Abstract

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 Letter, 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.