Theorie Kolloquium | November 24, 16:30

Physical response of non-Hermitian topological systems

Henning Schomerus

In photonic systems, gain and loss can be used to induce intriguing effects that are linked to non-Hermitian and topological physics. Prominent examples are exceptional points and the non-Hermitian skin effect, which can be used for enhanced sensing and directed amplification, as well as symmetry-protected states, which can be addressed by topological mode selection. Many of these applications make explicit use of mode nonorthogonality, which becomes especially interesting when the system is nonreciprocal. I describe how these effects can be probed in response theory, transport, and scattering, and highlight fundamental practical limits of the observability of some effects.


Lancaster University
Seminar Room 0.03, ETP
Contact: Sebastian Diehl