Unusual Nonlinear Dynamics Observed in NbN Superconducting Microwave Resonators

We report on some unusual nonlinear dynamics observed in several NbN superconducting stripline microwave resonators. Among the nonlinear effects observed: abrupt bifurcations within the resonance lineshape, hysteretic behavior, hysteresis loops changing direction, resonance shift and critical coupli...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 43; no. 1; pp. 1346 - 1349
Main Authors Abdo, Baleegh, Segev, Eran, Shtempluck, Oleg, Buks, Eyal
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.06.2006
Subjects
Bifurcations
Columnar structure
Hysteresis loops
Niobium nitride
Nonlinear dynamics
Nonlinearity
Physics
Resonance
Resonators
Superconductivity
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Summary:We report on some unusual nonlinear dynamics observed in several NbN superconducting stripline microwave resonators. Among the nonlinear effects observed: abrupt bifurcations within the resonance lineshape, hysteretic behavior, hysteresis loops changing direction, resonance shift and critical coupling. Weak links forming at the boundaries of the columnar structure of the NbN films are hypothesized as the main origin of the nonlinearities.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/43/1/329