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Highly Sensitive Electrometers Based on Single Cooper Pair Tunneling

Research output: Contribution to journalConference article

Published
  • A. B. Zorin
  • S. V. Lotkhov
  • Yu A. Pashkin
  • H. Zangerle
  • V. A. Krupenin
  • T. Weimann
  • H. Scherer
  • J. Niemeyer
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<mark>Journal publication date</mark>1/01/1999
<mark>Journal</mark>Journal of Superconductivity
Issue number6
Volume12
Number of pages9
Pages (from-to)747-755
Publication statusPublished
Original languageEnglish
EventProceedings of the 1998 International Workshop on 'Macroscopic Quantum Tunneling and Coherence' - Naples, Italy
Duration: 10/06/199813/06/1998

Conference

ConferenceProceedings of the 1998 International Workshop on 'Macroscopic Quantum Tunneling and Coherence'
CountryItaly
CityNaples
Period10/06/9813/06/98

Abstract

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 Ec 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 I-V curve which can be effectively modulated by the gate in two limit cases of external electrodynamic impedance Zs(ω): (a) Zs = Rs ≫ RQ ≈ 6.5 kΩ and (b) Rs ≪ RQ. Both circuits can serve as electrometers which are competitive with traditional single-electron devices. Preliminary experimental results are discussed.