Crossover from time-correlated single-electron tunneling to that of Cooper pairs
Artikel i vetenskaplig tidskrift, 2007

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.

single-electron tunneling

Single electron devices

Electronic transport in mesoscopic systems

Josephson devices

Coulomb blockade

Författare

Jonas Bylander

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Tim Duty

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Göran Johansson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

Per Delsing

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Physical Review B

1098-0211 (ISSN)

Vol. 76 020506(R)-

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