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

Author

Jonas Bylander

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Tim Duty

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Göran Johansson

Chalmers, Microtechnology and Nanoscience (MC2), Applied Quantum Physics

Per Delsing

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Physical Review B

1098-0211 (ISSN)

Vol. 76 2 020506(R)-

Subject Categories

Condensed Matter Physics

More information

Created

10/7/2017