Partial Time-Reversal Invariance Violation in a Flat, Superconducting Microwave Cavity with the Shape of a Chaotic Africa Billiard
B. Dietz, T. Klaus, M. Miski-Oglu, A. Richter, M. Wunderle
DOI 10.1103/PhysRevLett.123.174101 · Physical Review Letters
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We report on the experimental realization of a flat, superconducting microwave resonator, a microwave billiard, with partially violated time-reversal (T) invariance, induced by inserting a ferrite into the cavity and magnetizing it with an external magnetic field perpendicular to the resonator plane. In order to prevent its expulsion caused by the Meissner-Ochsenfeld effect, we used a cavity of which the top and bottom plate were made from niobium, a superconductor of type II, and cooled it down to liquid-helium temperature TLHe≃4 K. The cavity had the shape of a chaotic Africa billiard. Superconductivity rendered possible the accurate determination of complete sequences of the resonance frequencies and of the widths and strengths of the resonances, an indispensable prerequisite for the unambiguous detection of T invariance violation, especially when it is only partially violated. This allows for the first time the precise specification of the size of T invariance violation from the fluctuation properties of the resonance frequencies and from the strength distribution, which actually depends sensitively on it and thus provides a most suitable measure. For this purpose we derived an analytical expression for the latter which is valid for isolated resonances in the range from no T invariance violation to complete violation.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.2 | Pressure not reported | unknown |
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.2 | Pressure not reported | unknown |
Similar papers
Properties of eigenmodes and quantum-chaotic scattering in a superconducting microwave Dirac billiard with threefold rotational symmetry
similarity 0.94Weihua Zhang et al.
Source status unknown — claims are unverified
Distribution of eigenmodes in a superconducting stadium billiard with chaotic dynamics
similarity 0.93H.-D. Gräf et al.
Source status unknown — claims are unverified
Geometry-induced localization of thermal fluctuations in ultrathin superconducting structures
similarity 0.92W. V. Pogosov et al.
Source status unknown — claims are unverified
Phase Shift Experiments Identifying Kramers Doublets in a Chaotic Superconducting Microwave Billiard of Threefold Symmetry
similarity 0.92C. Dembowski et al.
Source status unknown — claims are unverified
Imaging the Statics and Dynamics of Superconducting Vortices and Antivortices Induced by Magnetic Microdisks
similarity 0.92R. B. G. Kramer et al.
Source status unknown — claims are unverified
Closed and open superconducting microwave waveguide networks as a model for quantum graphs
similarity 0.92Barbara Dietz et al.
Source status unknown — claims are unverified