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

F. Romeo and R. De Luca ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2005, vol. 44, issue 2, 225-227

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

Date: 2005
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DOI: 10.1140/epjb/e2005-00118-3

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