Cooper-pair resonances and subgap Coulomb blockade in a superconducting single-electron transistor
arXiv:cond-mat/0311148 · doi:10.1103/PhysRevB.76.172505
Abstract
We have fabricated and measured superconducting single-electron transistors with Al leads and Nb islands. At bias voltages below the gap of Nb we observe clear signatures of resonant tunneling of Cooper pairs, and of Coulomb blockade of the subgap currents due to linewidth broadening of the energy levels in the superconducting density of states of Nb. The experimental results are in good agreement with numerical simulations.
4 pages, 3 figures
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- Effect of decoherence on resonant Cooper-pair tunneling in a voltage-biased single-Cooper-pair transistor
- Applications and non-idealities of submicron Al-AlOx-Nb tunnel junctions
- Method for finding the critical temperature of the island in a SET structure
- Charge noise at Cooper-pair resonances
- Electronic and thermal sequential transport in metallic and superconducting two-junction arrays