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After a brief introduction into generic features of microwave resonators as quantum billiards and open scattering systems it is discussed how eigenvalues and eigenfunctions of a dissipative quantum system are measured near an exceptional point [1]. Besides T invariant systems billiards in which T is broken by an externally magnetized ferrite are considered and a method for the determination of the non-Hermitian Hamiltonian is presented [2]. This work has been supported within the SFB634 by the Deutsche Forschungsgemeinschaft. [1] C. Dembowski, H.-D. Gräf, H.L. Harney, A. Heine, W.D. Heiss, H. Rehfeld, and A. Richter, Phys. Rev. Lett. 86, 787 (2001). [2] B. Dietz, T. Friedrich, H. L. Harney, M. Miski-Oglu, A. Richter, F. Schäfer, and H. A. Weidenmüller, Phys. Rev. Lett. 98, 074103 (2007). |
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