Coulomb blockade of Cooper pair tunneling and parity effects in the Cooper pair transistor

Abstract

We have measured the Cooper Pair Transistor (CPT) in a tunable electromagnetic environment consisting of four one-dimensional SQUID arrays. The transport properties of the CPT in the high impedance limit, Z_env>>R_Q=6.45~kΩ, are studied for different ratios of the Josephson coupling energy to the charging energy. As the impedance of the environment is increased, the current-voltage characteristic (IVC) of the CPT develops a Coulomb blockade of Cooper pair tunneling and the measured IVCs agree qualitatively with a theory based on quasicharge dynamics for a CPT. Increasing the impedance of the environment induces a transition in the modulation of the IVC with the gate charge from e-periodic to 2e-periodic.

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• Quasiparticle poisoning and Josephson current fluctuations induced by Kondo impurities
• Parity effect in Al and Nb single electron transistors in a tunable environment
• Charge fluctuations in single-electron tunneling oscillations
• Phase-dependent transport in thermally-driven superconducting single-electron transistors
• Characterising superconducting filters using residual microwave background
• Mesoscopic electron transport and atomic gases, a review of Frank W. J. Hekking's scientific work