Crossover from time-correlated single-electron tunneling to that of Cooper pairs
Jonas Bylander, Tim Duty, Göran Johansson, Per Delsing
DOI 10.1103/PhysRevB.76.020506 · Physical Review B
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Abstract
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≳200fA, indicating Cooper-pair transport. For the parameters of the measured sample, we expect the Cooper-pair transport to be incoherent.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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