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Title: Suppression of Cooper-pair Tunneling in Superconducting Charge Boxes in Tunable Electromagnetic Environments
Authors: Kuo, Watson;Wu, Cen-Shawn;Shyu, J. H.;Chen, C. D.
Contributors: 物理學系
Date: 2007
Issue Date: 2013-03-12T04:06:29Z
Publisher: The American Physical Society
Abstract: The Cooper-pair tunneling in superconducting charge boxes in tunable electromagnetic environments is experimentally studied using a single-electron-transistor electrometer and via current-voltage characteristics measurement with small excitations. In the low-impedance regime, the environmental effect is quantified with an effective Josephson coupling energy, which is found to decrease as the environment impedance increases. In the high-impedance regime, the Cooper-pair tunneling is blockaded. For impedance above 250 MΩ, Coulomb oscillation of the zero-bias conductance suggests that Cooper-pair tunneling is completely suppressed and subgap quasiparticle tunneling becomes dominant.
Relation: Phys. Rev. B, 75(1): 014517
Appears in Collections:[Department of Physics] Periodical Articles

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