Volume 78, Number 5, June 2007
Article Number 57002
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 16 May 2007
EPL, 78 (2007) 57002
DOI: 10.1209/0295-5075/78/57002

Novel self-sustained modulation in superconducting stripline resonators

E. Segev, B. Abdo, O. Shtempluck and E. Buks

Department of Electrical Engineering, Technion - Haifa 32000, Israel

received 23 January 2007; accepted in final form 17 April 2007; published June 2007
published online 16 May 2007

We study thermal instability in a driven superconducting NbN stripline resonator integrated with a microbridge. A monochromatic input drive is injected into the resonator and the response is measured as a function of the frequency and amplitude of the drive. Inside a certain zone of the frequency-amplitude plane the system has no steady state, and consequently self-sustained modulation of the reflected power off the resonator is generated. A theoretical model, according to which the instability originates by a hotspot forming in the microbridge, exhibits a good quantitative agreement with the experimental results.

74.40.+k - Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.).
85.25.Am - Superconducting device characterization, design, and modeling.

© Europhysics Letters Association 2007