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Characterizing all non-Hermitian degeneracies using algebraic approaches: Defectiveness and asymptotic behavior
Sharareh Sayyad, Grigory A. Starkov
The presence of degeneracies plays a crucial role in describing the behavior of non-Hermitian (NH) systems. In these systems, there are two key types of degeneracies: -bolical d…
Converting non-Hermitian degeneracies of any order: Hierarchies of exceptional points and degeneracy manifolds
Grigory A. Starkov, Sharareh Sayyad
The emergence of various types of degeneracies plays a crucial role in optimizing and engineering different physical phenomena in non-Hermitian physics. In our work, we focus on th…
Multi-block exceptional points in open quantum systems
Aysel Shiralieva, Grigory A. Starkov, Björn Trauzettel
Open quantum systems can be approximately described by non-Hermitian Hamiltonians (NHHs) and Liouvillian superoperators. The two approaches differ by quantum jump terms correspondi…