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Ratchet potential in d.c. SQUID’s and reduced two-junction interferometer models

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  • F. Romeo
  • R. De Luca

Abstract

For finite values of the parameter β and in the presence of small structural asymmetry and inhomogeneity of the junctions parameters, the two-junction interferometer model can be described by means of a single non-linear differential equation in such a way that a ratchet potential for SQUID’s can be deduced. The resulting dynamical equation, derived for first-order corrections with respect to a symmetric and homogeneous model with β=0, presents an additional second-harmonic term and a cosine term in the expression for the effective current-phase relation. For opportune values of the perturbation parameters a ratchet potential with pre-definite characteristics can be obtained. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Suggested Citation

  • F. Romeo & R. De Luca, 2005. "Ratchet potential in d.c. SQUID’s and reduced two-junction interferometer models," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 44(2), pages 225-227, March.
    • Handle: RePEc:spr:eurphb:v:44:y:2005:i:2:p:225-227
    DOI: 10.1140/epjb/e2005-00118-3
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