Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 22: Superconductivity – Poster I
TT 22.24: Poster
Monday, March 9, 2026, 18:00–20:00, P1
Chaotic Behavior of Josephson Diodes — •Vjeko Dimić1, Simon Feyrer1, Alexander Kirchner1, Daniel Crawford2, Davide Curcio3, Giorgio Biasiol3, Tero Heikkilä2, Christoph Strunk1, and Leandro Tosi1,4 — 1Institute of Experimental and Applied Physics, University of Regensburg, Germany — 2Department of Physics and Nanoscience Center, University of Jyväskylä — 3CNR-Istituto Officina dei Materiali Laboratorio TASC, Italy — 4Centro Atomico Bariloche, Comision Nacional de Energia Atomica, Argentina
The behavior of nonlinear resonators is well described by the Duffing oscillator model. For sufficiently high driving powers, the response of the system has three solutions, two metastable, and one unstable, i.e., the system enters bifurcation regime. This also applies for nonlinear superconducting resonators where the nonlinearity stems from the nonlinear behavior of Josephson junctions. If instead we have a junction exhibiting the Josephson diode effect, the Duffing model acquires an additional term which results in reemergence of stable solutions for certain parameters. Here we present the design and measurement of two tunable λ/4 resonators fabricated out of a hybrid Al/InAs heterostructure. One resonator is terminated with a single Josephson junction, while the other is terminated with a SQUID. We perform microwave measurements of the resonators and observe the onset of the bifurcation regime in both devices, while the reemergence of stable solutions is observed in the SQUID device. We have also explored the dependence with in-plane magnetic field, in particular the range where superconducting diode effect has been observed.
Keywords: Josephson diode effect; SQUID; Microwave resonator; Al/InAs