Highly Sensitive Electrometers Based on Single Cooper Pair Tunneling

Zorin, A. B. and Lotkhov, S. V. and Pashkin, Yu A. and Zangerle, H. and Krupenin, V. A. and Weimann, T. and Scherer, H. and Niemeyer, J. (1999) Highly Sensitive Electrometers Based on Single Cooper Pair Tunneling. Journal of Superconductivity, 12 (6). pp. 747-755. ISSN 0896-1107

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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.

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Journal Article
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Journal of Superconductivity
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20 May 2019 08:40
Last Modified:
22 Nov 2022 07:30