Spectral properties of Bunimovich mushroom billiards.
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 supershell effect in the level density and a dip in the nearest-neighbor spacing distribution. Theoretical predictions for the quantum properties of mixed systems rely on the sharp separability of phase space--an unusual property met by mushroom billiards. We however find deviations which are ascribed to the presence of dynamic tunneling.
Dietz
B
B
Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
Friedrich
T
T
Miski-Oglu
M
M
Richter
A
A
Schäfer
F
F