Abstract
Frequency and width crossing have been observed for two coupled resonances in a microwave cavity. The cavity consisted of two nearly identical rectangular boxes. The boxes were coupled by a slit of variable width. The data are well described by a non-Hermitean S matrix leading to a non-Hermitean effective Hamiltonian. The values of the interaction strength for which width crossing and frequency crossing, respectively, were observed, are above and below a critical value for which one expects a joint frequency and width crossing.
- Received 20 October 1999
DOI:https://doi.org/10.1103/PhysRevE.62.1922
©2000 American Physical Society