Non-hermitian topology in multiterminal superconducting junctions

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 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.

7 pages, 3 figures

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Cited by in corpus (9)

• Non-Hermitian superconducting diode effect
• Signatures of exceptional points in multiterminal superconductor-normal metal junctions
• Exceptional Andreev spectrum and supercurrent in p-wave non-Hermitian Josephson junctions
• Non-Hermitian Josephson junctions with four Majorana zero modes
• Supercurrent from the imaginary part of the Andreev levels in non-Hermitian Josephson junctions
• Short-time behavior of a system ruled by non-Hermitian time-dependent Hamiltonians
• Breakdown of Non-Bloch Bulk-Boundary Correspondence and Emergent Topology in Floquet Non-Hermitian Systems
• Computation and Verification of Spectra for Non-Hermitian Systems
• Interacting many-body non-Hermitian systems as Markov chains