Signatures of exceptional points in multiterminal superconductor-normal metal junctions
arXiv:2504.00524 · doi:10.1103/dmfm-71l6
Abstract
We study a non-Hermitian, multiterminal superconducting-normal system in order to identify experimental signatures of exceptional points. We focus on a minimal setting with a single spinful level, spin-dependent normal leads, and a noncollinear magnetic field. This system hosts both topologically-protected, as well as symmetry-protected exceptional points. Using an exact transport formalism, we show that the exceptional points leave signatures visible through spectroscopy of the Andreev states, but that they have a minor effect on the Josephson current. We also argue that these findings hold with interactions.
5+3 pages, 5 figures
References in corpus (11)
- A phenomenological position and energy resolving Lindblad approach to quantum kinetics
- Observation of non-Hermitian topology in a multi-terminal quantum Hall device
- Non-Hermitian Fermi-Dirac Distribution in Persistent Current Transport
- Non-Hermitian phase-biased Josephson junctions
- Josephson effect in a junction coupled to an electron reservoir
- Anomalous Andreev Spectrum and Transport in Non-Hermitian Josephson Junctions
- Non-hermitian topology in multiterminal superconducting junctions
- Non-Hermitian multiterminal phase-biased Josephson junctions
- Fractional Josephson effect versus fractional charge in superconducting-normal metal hybrid circuits
- Topological transitions in quantum jump dynamics: Hidden exceptional points
- Andreev non-Hermitian Hamiltonian for open Josephson junctions from Green's functions