Suppression of Cooper-pair tunneling in superconducting charge boxes in tunable electromagnetic environments

Watson Kuo, C. S. Wu, J. H. Shyu, C. D. Chen

Research output: Contribution to journalArticle

2 Citations (Scopus)

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.

Original languageEnglish
Article number014517
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number1
DOIs
Publication statusPublished - 2007 Jan 29

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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