<< When waves are able to absorb or release energy, so-called "exceptional points" occur, around which the waves show quite peculiar behaviour >>
<< Exceptional points occur, when the shape and the absorption of a system can be tuned in such a way that two different waves can meet at one specific complex frequency >>
<< At this exceptional point the waves not only share the same frequency and absorption rate, but also their spatial structure is the same. One may thus really interpret this as two wave states merging into a single one at the exceptional point. >>
The exception and its rules. 'Exceptional points' give rise to counterintuitive physical effects. Vienna University of Technology. 27 Jul 2016.
Jorg Doppler, Alexei A. Mailybaev, et al. Dynamically encircling an exceptional point for asymmetric mode switching. Nature (2016) doi:10.1038/nature18605. Published online 25 July 2016