Phase shift experiments identifying Kramers doublets in a chaotic superconducting microwave billiard of threefold symmetry.
The spectral properties of a two-dimensional microwave billiard showing threefold symmetry have been studied with a new experimental technique. This method is based on the behavior of the eigenmodes under variation of a phase shift between two input channels, which strongly depends on the symmetries of the eigenfunctions. Thereby a complete set of 108 Kramers doublets has been identified by a simple and purely experimental method. This set clearly shows Gaussian unitary ensemble statistics, although the system is time-reversal invariant.
Dembowski
C
C
Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
Dietz
B
B
Gräf
H-D
HD
Heine
A
A
Leyvraz
F
F
Miski-Oglu
M
M
Richter
A
A
Seligman
T H
TH