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TT: Fachverband Tiefe Temperaturen

TT 46: SC: Tunneling, Josephson Junctions, SQUIDs 1

TT 46.3: Talk

Thursday, March 17, 2011, 11:00–11:15, HSZ 301

Nonreciprocal microwave transmission through a long Josephson junction — •Kirill G. Fedorov, Hannes Rotzinger, and Alexey V. Ustinov — Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany

We are experimentally investigating microwave transmission through a long Josephson junction. In the flux-flow state, the transmission coefficient depends on the direction of fluxon propagation in the junction. This behavior is based on the modulation of the fluxon chain density by the external microwave radiation applied at the junction boundary.

We have measured the transmission characteristics of 10 GHz microwaves through a long Josephson junction embedded into a resonator that facilitates impedance matching. An enhancement of the microwave transmission occurs when the direction of flux flow coincides with the direction of microwave propagation. Reversal of either the in-plane magnetic field or bias current leads to suppression of the transmitted power due to the reversed direction of flux flow. We envision applications of the described effect for designing microwave on-chip isolators, circulators and amplifiers.