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Published on: August 2, 2019
Non-Hermitian Topology in Multiterminal Superconducting Junctions
David Christian Ohnmacht1, Valentin Wilhelm1, Hannes Weisbrich1
1Universität Konstanz, Fachbereich Physik, D-78457 Konstanz, Germany.
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.
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