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ST459 - Effect of LC-shunting on the IV-characteristics of a Josephson Junction under Microwave Radiation

https://snf.ieeecsc.org/sites/ieeecsc.org/files/documents/snf/abstracts/hdrShukrinov%2BKulikov%2C%20Kiryll_poster_081015_0.pdf
Effect of LC-shunting on the IV-characteristics of a Josephson Junction under Microwave Radiation
 
Yury Shukrinov1,2, Ilhom Rahmonov1,3, Kirill Kulikov1,2, Paul Seidel4, Andrej Plecenik5
 
1BLTP, JINR, Dubna, Moscow Region 141980, Russia
2International University of Dubna, Moscow Region 141980, Russia 3Umarov PTI, TAS, Dushanbe, 734063, Tajikistan
4Institut  für Festkörperphysik, FSU Jena, D-07743 Jena, Germany 5Department of Experimental Physics, Comenius University in Bratislava, Bratislava, Slovakia
 
 
Abstract — We study the resonance features of the coupled system of Josephson junctions shunted by the LC-elements under electromagnetic irradiation. A strong effect of the external radiation on the IV-characteristics and voltage-time dependence is demonstrated. Crucial changes are found at the resonance condition when radiation frequency coincides with the Josephson and resonance circuit frequencies. It changes the amplitude dependence of the Shapiro step width. The optimized LC shunt leads to the increased step height for steps on the resonance branch of IV-characteristics at low amplitudes. The shunting of the Josephson junctions provides an extended range using the same microwave source, because Shapiro step demonstrates the first Bessel maximum at a much smaller power of radiation in comparison to the case of unshunted Josephson junctions. These features of Shapiro step on the resonance branch might be interesting for quantum metrology.

Keywords (Index Terms) — Josephson junction, LC shunt, resonance, electromagnetic radiation. IV characteristic, Shapiro step, quantum metrology.

IEEE/CSC & ESAS SUPERCONDUCTIVITY NEWS FORUM (global edition), July 2015.
Selected August 10, 2015. Reference ST459; Category 4. 
Invited poster HF-P04-INV presented at ISEC 2015; Nagoya, Japan, July 6 – 9, 2015.