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

Jonas Bylander (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Tim Duty (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Göran Johansson (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; Per Delsing (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik)
Physical Review B (1098-0211). Vol. 76 (2007), 2, p. 020506(R).
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Coulomb blockade, single-electron tunneling, Electronic transport in mesoscopic systems, Single electron devices, Josephson devices



Denna post skapades 2007-07-29. Senast ändrad 2016-08-15.
CPL Pubid: 44555