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Scattering Experiments with Microwave Billiards at an Exceptional Point under Broken Time Reversal Invariance
S. Bittner, B. Dietz, H. L. Harney +3
Scattering experiments with microwave cavities were performed and the effects of broken time-reversal invariance (TRI), induced by means of a magnetized ferrite placed inside the c…
Double-Slit Experiments with Microwave Billiards
S. Bittner, B. Dietz, M. Miski-Oglu +3
Single and double-slit experiments are performed with two microwave billiards with the shapes of a rectangle, respectively, a quarter stadium. The classical dynamics of the former…
Exceptional Points in a Microwave Billiard with Time-Reversal Invariance Violation
B. Dietz, H. L. Harney, O. N. Kirillov +3
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 H…
Experimental test of a trace formula for two-dimensional dielectric resonators
S. Bittner, E. Bogomolny, B. Dietz +4
Resonance spectra of two-dimensional dielectric microwave resonators of circular and square shapes have been measured. The deduced length spectra of periodic orbits were analyzed a…
Cross-Section Fluctuations in Chaotic Scattering
B. Dietz, H. L. Harney, A. Richter +2
For the theoretical prediction of cross-section fluctuations in chaotic scattering, the cross-section autocorrelation function is needed. That function is not known analytically. U…
Friedel Oscillations in Microwave Billiards
A. Baecker, B. Dietz, T. Friedrich +4
Friedel oscillations of electron densities near step edges have an analog in microwave billiards. A random plane wave model, normally only appropriate for the eigenfunctions of a p…
Quantum Chaotic Scattering in Microwave Resonators
B. Dietz, T. Friedrich, H. L. Harney +4
In a frequency range where a microwave resonator simulates a chaotic quantum billiard, we have measured moduli and phases of reflection and transmission amplitudes in the regimes o…
Nonperiodic echoes from quantum mushroom billiard hats
B. Dietz, T. Friedrich, M. Miski-Oglu +3
Nonperiodic tunable quantum echoes have been observed in experiments with an open microwave billiard whose geometry under certain conditions provides Fibonacci like sequences of cl…
Induced Violation of Time-Reversal Invariance in the Regime of Weakly Overlapping Resonances
B. Dietz, T. Friedrich, H. L. Harney +5
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…
Chaotic Scattering in the Regime of Weakly Overlapping Resonances
B. Dietz, T. Friedrich, H. L. Harney +4
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…
Spectral properties of Bunimovich mushroom billiards
B. Dietz, T. Friedrich, M. Miski-Oglu +2
Properties of a quantum mushroom billiard in the form of a superconducting microwave resonator have been investigated. They reveal unexpected nonuniversal features such as, e.g., a…
First Experimental Observation of Superscars in a Pseudointegrable Barrier Billiard
E. Bogomolny, B. Dietz, T. Friedrich +4
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 70…