Current-Phase Relation and Josephson Inductance of Superconducting Cooper Pair Transistor

preprint2009arXivOpen access

Abstract

We have investigated the Josephson inductance LJL_J of a Superconducting Cooper Pair Transistor (SCPT). We traced the inductance using microwave reflection measurements on a tuned resonance circuit in which a SCPT was mounted in parallel to a ∼200 \sim 200 pH strip line inductance. When the inverse of the Josephson inductance, determined on the charge-phase bias plane for a SCPT with a Josephson to Coulomb energy ratio of EJ/EC=1.75E_J/E_C =1.75, is integrated over the phase, we obtain a current-phase relation, which is strongly non-sinusoidal near the charge degeneracy point.

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