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Single-electron and Cooper-pair tunneling in ultrasmall Josephson junctions. Coulomb and environmental effects

✍ Scribed by A. D. Zaikin

Publisher
Springer US
Year
1992
Tongue
English
Weight
715 KB
Volume
88
Category
Article
ISSN
0022-2291

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✦ Synopsis

We study the I-V curve of a small capacitance Josephson tunnel junction with a zero subgap conductance. In the limit of large external impedance and at low temperature, single electron tunneling across the junction is suppressed for eV < 2A + Ec due to a combination of superconducting and Coulomb gaps and the process of Cooper pair tunneling (CPT) plays the main role. For Ec >~ 2A Coulomb interaction between electrons of a tunneling Cooper pair strongly modifies the effective Josephson coupling energy and the CPT current can substantially deviate from its standard value. Very close to the point eV = 2A the effective tunneling time of a Cooper pair becomes very large and the CPT process is not adiabatic.

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