Flore Kunst | Exceptional non-Hermitian topology

Описание: ▶Title: Exceptional non-Hermitian topology
▶Speaker: Flore Kunst ( MPI for the Science of Light )
▶Abstract: While topological phases of matter have predominantly been studied for isolated Hermitian systems, a recent shift has been made towards considering these phases in the context of non-Hermitian Hamiltonians. Non-Hermitian topological phenomena reveal an enrichment of the phenomenology of topological phases, and forms a rapidly growing new cross-disciplinary field. In this talk, we will see that non-Hermitian Hamiltonians, which come about due to, e.g., gain and loss, feature many exotic properties, which are radically different from their Hermitian counterparts. In particular, I will focus on our recent work on higher-order exceptional points, which are truly non-Hermitian degeneracies, and symmetries, and present explicit toy models to illustrate our findings.

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