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- C. Dembowski, Barbara Dietz, +4 authors Christiaan Richter
- Physical review letters
- 2002

We have measured resonance spectra in a superconducting microwave cavity with the shape of a three-dimensional generalized Bunimovich stadium billiard and analyzed their spectral fluctuationâ€¦ (More)

- Barbara Dietz, Hanns L. Harney, Oleg N. Kirillov, M Miski-Oglu, Achim Richter, F. Schaefer
- Physical review letters
- 2011

We report on the experimental study of an exceptional point (EP) in a dissipative microwave billiard with induced time-reversal invariance (T) violation. The associated two-state Hamiltonian isâ€¦ (More)

- C. Dembowski, Barbara Dietz, +4 authors Achim Richter
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2004

We calculate analytically the geometric phases that the eigenvectors of a parametric dissipative two-state system described by a complex symmetric Hamiltonian pick up when an exceptional point (EP)â€¦ (More)

- Barbara Dietz, Andreas von Heine, Achim Richter, Oriol Bohigas, Patricio Leboeuf
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2006

We present experimental results on the eigenfrequency statistics of a superconducting, chaotic microwave billiard containing a rotatable obstacle. Deviations of the spectral fluctuations fromâ€¦ (More)

- Barbara Dietz, Thomas Friedrich, +5 authors Hans A. WeidenmÃ¼ller
- Physical review letters
- 2009

We measure the complex scattering amplitudes of a flat microwave cavity (a "chaotic billiard"). Time-reversal (T) invariance is partially broken by a magnetized ferrite placed within the cavity. Weâ€¦ (More)

- Barbara Dietz, Thomas Friedrich, +4 authors Hans A. WeidenmÃ¼ller
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2008

We measure the transmission and reflection amplitudes of microwaves in a resonator coupled to two antennas at room temperature in the regime of weakly overlapping resonances and in a frequency rangeâ€¦ (More)

- Barbara Dietz, Thomas Friedrich, M Miski-Oglu, Achim Richter, Thomas H. Seligman, Katerina L Zapfe
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2006

Mushroom billiards have the remarkable property to show one or more clear cut integrable islands in one or several chaotic seas, without any fractal boundaries. The islands correspond to orbitsâ€¦ (More)

- Barbara Dietz, Th. Klaus, M Miski-Oglu, Achim Richter, M Wunderle, Chayma Bouazza
- Physical review letters
- 2016

We study distributions of the ratios of level spacings of rectangular and Africa-shaped superconducting microwave resonators containing circular scatterers on a triangular grid, so-called Diracâ€¦ (More)

- C. Dembowski, Barbara Dietz, +4 authors Achim Richter
- Physical review letters
- 2003

A microwave experiment has been realized to measure the phase difference of the oscillating electric field at two points inside the cavity. The technique has been applied to a dissipative resonatorâ€¦ (More)

- EugÃ¨ne Bogomolny, Barbara Dietz, +4 authors Charles Schmit
- Physical review letters
- 2006

With a perturbation body technique intensity distributions of the electric field strength in a flat microwave billiard with a barrier inside up to mode numbers as large as about 700 were measured. Aâ€¦ (More)