Cooper-pair tunneling in small junctions with tunable Josephson coupling

Article

关键词: SINGLE-ELECTRON TRANSISTOR;    PARITY-INDUCED SUPPRESSION;    ELECTROMAGNETIC ENVIRONMENT;    COULOMB-BLOCKADE;   

DOI  :  10.1103/PhysRevB.54.6608

来源: SCIE

【 摘 要 】

We investigate Cooper-pair tunneling in a circuit consisting of two dc-superconducting quantum interference devices in series, with a gate capacitively coupled to the central island. Measurements cover a wide range of values of the ratio between Josephson coupling energy E(J) and charging energy E(C). The E(J)/E(C) ratio dependence of the supercurrent is well described by the orthodox theory provided that strong fluctuations of the Josephson phase due to the electromagnetic environment are taken into account. Our data can be interpreted in terms of squeezing of the charge fluctuations with decreasing E(J)/E(C) ratio.

【 授权许可】

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