Induced violation of time-reversal invariance in the regime of weakly overlapping resonances.
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. We extend the random-matrix approach to T violation in scattering, determine the parameters from some properties of the scattering amplitudes, and successfully predict others. Our work constitutes the most precise test of the random-matrix theoretical approach to T violation so far available.
Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
B
B
Dietz
T
T
Friedrich
H L
HL
Harney
M
M
Miski-Oglu
A
A
Richter
F
F
Schäfer
J
J
Verbaarschot
H A
HA
Weidenmüller