Journal of Superconductivity

, Volume 12, Issue 6, pp 747–755 | Cite as

Highly Sensitive Electrometers Based on Single Cooper Pair Tunneling

  • A. B. Zorin
  • S. V. Lotkhov
  • Yu. A. Pashkin
  • H. Zangerle
  • V. A. Krupenin
  • T. Weimann
  • H. Scherer
  • J. Niemeyer


A superconducting transistor structure comprising two Josephson tunnel junctions connected in series and a small island in between, which is capacitively coupled to a gate, is considered. When self-capacitances of the junctions are sufficiently small that the corresponding charging energy E c is of the order of magnitude of the Josephson coupling strength EJ (and both are ≫kBT), the interplay of the charging and Josephson effects in the circuit becomes essential. This leads to a characteristic IV curve which can be effectively modulated by the gate in two limit cases of external electrodynamic impedance Z s (ω): (a) Z s = R s R Q ≈ 6.5 kΩ and (b) R s R Q . Both circuits can serve as electrometers which are competitive with traditional single-electron devices. Preliminary experimental results are discussed.

Coulomb and Josephson effects thermal and quantum fluctuations ultrasmall tunnel junctions 


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Copyright information

© Plenum Publishing Corporation 1999

Authors and Affiliations

  • A. B. Zorin
    • 1
  • S. V. Lotkhov
    • 1
  • Yu. A. Pashkin
    • 2
  • H. Zangerle
  • V. A. Krupenin
    • 3
  • T. Weimann
    • 1
  • H. Scherer
    • 1
  • J. Niemeyer
    • 1
  1. 1.Physikalisch-Technische BundesanstaltBraunschweigGermany
  2. 2.Lebedev Physical Institute, Russian Academy of SciencesMoscowRussian Federation
  3. 3.Laboratory of CryoelectronicsMoscow State UniversityMoscowRussian Federation

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