Zobrazeno 1 - 10
of 154
pro vyhledávání: '"Gräf, H D"'
Autor:
Dembowski, C., Dietz, B., Friedrich, T., Graef, H. -D., Heine, A., Mejia-Monasterio, C., Miski-Oglu, M., Richter, A., Seligman, T. H.
Publikováno v:
Phys. Rev. Lett. 93, 134102 (2004)
A self-pulsing effect termed quantum echoes has been observed in experiments with an open superconducting and a normal conducting microwave billiard whose geometry provides soft chaos, i.e. a mixed phase space portrait with a large stable island. For
Externí odkaz:
http://arxiv.org/abs/nlin/0408046
Publikováno v:
Phys. Rev. E 69, 056216 (2004)
We calculate analytically the geometric phases that the eigenvectors of a parametric dissipative two-state system described by a complex symmetric Hamiltonian pick up when an exceptional point (EP) is encircled. An EP is a parameter setting where the
Externí odkaz:
http://arxiv.org/abs/nlin/0402015
In a recent paper [Phys. Rev. E 67, 026204 (2003)], Rotter calculates the geometric phases that are picked up by the eigenvectors of a two-state quantum system when an exceptional point is encircled. In addition to the geometric phases observed by De
Externí odkaz:
http://arxiv.org/abs/nlin/0309066
Publikováno v:
Phys.Rev.Lett.90:034101,2003
A microwave experiment has been realized to measure the phase difference of the oscillating electric field at two points inside the cavity. The technique has been applied to a dissipative resonator which exhibits a singularity -- called exceptional p
Externí odkaz:
http://arxiv.org/abs/nlin/0212023
Autor:
Dembowski, C., Dietz, B., Graef, H. -D., Heine, A., Leyvraz, F., Miski-Oglu, M., Richter, A., Seligman, T. H.
Publikováno v:
Phys. Rev. Lett. 90, 014102 (2003)
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
Externí odkaz:
http://arxiv.org/abs/nlin/0211033
Publikováno v:
Phys. Rev. Lett. 89, 064101 (2002)
We have measured resonance spectra in a superconducting microwave cavity with the shape of a three-dimensional generalized Bunimovich stadium billiard and analyzed their spectral fluctuation properties. The experimental length spectrum exhibits contr
Externí odkaz:
http://arxiv.org/abs/nlin/0206028
Autor:
Brunken, M., Genz, H., Gopych, M., Graef, H. -D., Khodyachykh, S., Kostial, S., Laier, U., Lenhardt, A., Loos, H., Muehl, J., Platz, M., Richter, A., Richter, S., Schweizer, B., Stascheck, A., Titze, O., Watzlawik, S., Doebert, S.
Publikováno v:
eConf C000821 (2000) MOc04
The S-DALINAC is a 130 MeV superconducting recirculating electron accelerator serving several nuclear and radiation physics experiments as well as driving an infrared free-electron laser. A system of normal conducting rf resonators for noninvasive be
Externí odkaz:
http://arxiv.org/abs/physics/0008078
Publikováno v:
Phys.Rev.Lett.84:867-870,2000
We report on first experimental signatures for chaos-assisted tunneling in a two-dimensional annular billiard. Measurements of microwave spectra from a superconducting cavity with high frequency resolution are combined with electromagnetic field dist
Externí odkaz:
http://arxiv.org/abs/chao-dyn/9911023
Publikováno v:
Phys. Rev. E 60, 3942 (1999)
The field distributions and eigenfrequencies of a microwave resonator which is composed of 20 identical cells have been measured. With external screws the periodicity of the cavity can be perturbed arbitrarily. If the perturbation is increased a tran
Externí odkaz:
http://arxiv.org/abs/chao-dyn/9907022
Publikováno v:
Phys. Rev. E 60, 2851 (1999).
We compare the statistical properties of eigenvalue sequences for a gamma=1 Bunimovich stadium billiard. The eigenvalues have been obtained by two ways: one set results from a measurement of the eigenfrequencies of a superconducting microwave resonat
Externí odkaz:
http://arxiv.org/abs/chao-dyn/9906032