Cooper-pair resonances and subgap Coulomb blockade in a superconducting single-electron transistor

Details Cooper-pair resonances and subgap Coulomb blockade in a superconducting single-electron transistor Cooper-pair resonances and subgap Coulomb blockade in a superconducting single-electron transistor

2003-11-07

arxiv.org/abs/cond-mat/0311148v2

PHYSICAL REVIEW B 76, 172505 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.76.172505

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.

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