| TYPE | Solid State Institute Seminar |
| Speaker: | Prof.Alexei Mailybaev |
| Affiliation: | Institue of pure and applied mathematics. IMPA Rio De Janeiro, Brazil |
| Date: | 12.12.2018 |
| Time: | 12:30 - 13:30 |
| Location: | Solid State Auditorium(Entrance) |
| Remark: | Host: Prof. Nimrod Moiseyev |
| Presentation: |  |
| Abstract: | We discuss exceptional point (EP) degeneracies in linear PT-symmetric systems, focusing specifically on
waveguides. Here EP is the point, where two eigenvalues and respective eigenvectors merge forming the
Jordan block algebraic structure, and PT-symmetry features wave systems, where loss is compensated by
gain in a parity-symmetric manner. We start with a general introduction describing the mathematical
structure and physical significance of spectral properties related to EPs. As the central application, we
show that vanishing of a group velocity (i.e., full stop of a light pulse) in a waveguide is related to the EP
condition. This result is supported by numerical simulations for a pair of coupled waveguides, where the
gain/loss parameter is changed adiabatically in time
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