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

机译:从时间相关的单电子隧道到库珀对的交叉

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摘要

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 approx > 200 fA, indicating Cooper-pair transport. For the parameters of the measured sample, we expect the Cooper-pair transport to be incoherent.
机译:我们已经研究了使用单电子晶体管在约瑟夫森小结的一维链中的电荷传输。我们观察到从时间相关的单个电子隧穿到库珀对的隧穿随磁场和电流的变化。在较高的磁场下,单电子传输起主导作用,其隧穿频率由f = I / e给出,其中I是通过链的电流,e是电子的电荷。随着磁场的降低,当I大约> 200 fA时,频率逐渐移至f = I / 2e,这表明库珀对传输。对于被测样品的参数,我们期望库珀对传输是不连贯的。

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