QuCoLiMa Talk - Flore Kunst - Non-Hermitian topological phenomena: Exceptional points, symmetry and breakdown of the bulk-boundary correspondence

Jun 28
28. June 2022 12:00 - 13:00
On-site in Erlangen, Lecture Hall H & livestream via Zoom

Speaker:
Flore Kunst – MPL Erlangen

Title:
Non-Hermitian topological phenomena: Exceptional points, symmetry and breakdown of the bulk-boundary correspondence

Location:
On-site in Erlangen, Lecture Hall H & livestream via Zoom
– Erlangen: Livestream/Presentation in lecture hall H + open sandwiches in the foyer afterwards
– Saarbrücken: Livestream/Presentation in Konferenzraum 407
– Mainz: tba

Zoom-Link: http://www.qucolima.de/join-qucolima-talk

Abstract:
While topological phases of matter have mostly been studied for closed,
Hermitian systems, a recent shift has been made towards considering these
phases in the context of non-Hermitian Hamiltonians, which form a useful
approach to describe dissipation. Such Hamiltonians may feature many exotic properties, which are radically different from their Hermitian counterparts, such as the generic appearance of exceptional points, a break down of the famed bulk-boundary correspondence, and the piling up of bulk states at the boundaries known as the non-Hermitian skin effect. In this talk, I will study these features in more detail, and discuss the appearance of exceptional points in the presence of symmetries. Additionally, I will show that even though the conventional bulk-boundary correspondence breaks down, it is possible to define a biorthogonal bulk-boundary correspondence by making use of biorthogonal quantum mechanics.

– – –
QuCoLiMa Talks are the weekly seminar of the collaborative research center TRR 306 QuCoLiMa (Quantum Cooperativity of Light and Matter). The talks are given by (external) experts, whose research falls within the scope of QuCoLiMa.

More information at http://www.qucolima.de/talks