Bulk Bogoliubov Fermi arcs in non-Hermitian superconducting systems

Abstract

We consider a non-Hermitian superconducting system by coupling a conventional superconductor to a ferromagnet lead and demonstrate the emergence of exceptional points when an external Zeeman field is applied. We discover that, depending on the non-Hermiticity and the Zeeman field, the exceptional points mark the ends of lines with zero real energy, thus giving rise to topologically protected and highly tunable bulk Fermi arcs, which we coin bulk Bogoliubov Fermi arcs due to their superconducting nature. We show that these bulk Bogoliubov Fermi arcs are the non-Hermitian counterparts of the Hermitian topological phase transition but are much more prevalent and also experimentally detectable through large spectral signatures.

9 pages, 6 figures. Published version

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• Non-Hermitian minimal Kitaev chains
• Andreev non-Hermitian Hamiltonian for open Josephson junctions from Green's functions
• Light-induced Floquet spin-triplet Cooper pairs in unconventional magnets
• Majorana zero-modes in a dissipative Rashba nanowire
• Anomalous proximity effect under Andreev and Majorana bound states
• Non-Hermitian Josephson junctions with four Majorana zero modes
• Engineering subgap states in superconductors by the symmetry of altermagnetism
• Supercurrent from the imaginary part of the Andreev levels in non-Hermitian Josephson junctions
• Hexagonal Warping Control of Exceptional Points in Topological Insulator--Ferromagnetic Heterojunctions