Crossover from time-correlated single-electron tunneling to that of Cooper pairs

Details Crossover from time-correlated single-electron tunneling to that of Cooper pairs Crossover from time-correlated single-electron tunneling to that of Cooper pairs

2007-05-21

arxiv.org/abs/0705.2964v2

Phys. Rev. B vol. 76, 020506(R) (2007)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures; v2: minor changes, clarifications, additions

Scientific paper

10.1103/PhysRevB.76.020506

We have studied charge transport in a one-dimensional chain of small Josephson junctions using a single-electron transistor. We observe a crossover from time-correlated tunneling of single electrons to that of Cooper pairs as a function of both magnetic field and current. At relatively high magnetic field, single-electron transport dominates and the tunneling frequency is given by f=I/e, where I is the current through the chain and e is the electron's charge. As the magnetic field is lowered, the frequency gradually shifts to f=I/2e for I>200 fA, indicating Cooper-pair transport. For the parameters of the measured sample, we expect the Cooper-pair transport to be incoherent.

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