ISSN:
1572-9605
Keywords:
Coulomb and Josephson effects
;
thermal and quantum fluctuations
;
ultrasmall tunnel junctions
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
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 E c is of the order of magnitude of the Josephson coupling strength E J (and both are ≫k B T), 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1007780925567
