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

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

2006-06-15

arxiv.org/abs/cond-mat/0606407v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.74.224505

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~k\Omega, 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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