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First results on microwave billiards with broken time reversal symmetry are presented. The billiards are quasi two dimensional with an attached microwave isolator acting as a unidirectional transmission line. Spectral level dynamics was studied by changing the billiard length. For all spectral properties observed, i.e., nearest-neighbor distance, asymptotic curvature, and closest-approach distance at avoided crossings, we have found behavior characteristic of the Gaussian unitary ensemble.
Stoffregen et al. (Mon,) studied this question.