Half-harmonic generation in Josephson tunnel junctions and microbridges is investigated theoretically, numerically, and experimentally. It is found that such generation may take place both at zero voltage and on rf-induced steps in tunnel junctions, but not in microbridges. A simplified theory, which leads to the definition of a plasma resonance on rf-induced steps, is presented. The experiments are made on junctions with different current densities and with pump frequencies at 18 and 70 GHz.
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This work was supported by The Danish Natural Science Research Council, grants 511-8048, 511-10098, 511-10279, and 511-15059.
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Pedersen, N.F., Soerensen, O.H., Dueholm, B. et al. Half-harmonic parametric oscillations in Josephson junctions. J Low Temp Phys 38, 1–23 (1980). https://doi.org/10.1007/BF00115266
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DOI: https://doi.org/10.1007/BF00115266