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EnglishThe dynamical equations for the superconducting phase differences of a conventional d.c. SQUID in the presence of small structural asymmetry and coupling energy inhomogeneity can be studied by means of a reduced two-junction interferometer model. In this context, the resulting dynamics can be described by a single first-order nonlinear differential equation, in which adjustable parameters are present. As a consequence, a ratchet-like potential can be obtained for a convenient choice of parameters. We show, in a zero thermal noise case, that asymmetric d.c. SQUIDs can operate as voltage rectifiers under an external deterministic a.c. signal. Average voltage quantization in the I-V characteristics of the device can be observed as an effect of phase-locking mechanisms. Analytic expressions for the constant voltage steps appearing in the I-V characteristics can be found as a function of the bias current and of the a.c. amplitude of the forcing term.
| Titolo: | Deterministic ratchet effect in asymmetric d. c. SQUID’s |
| Autori: | |
| Data di pubblicazione: | 2005 |
| Rivista: | |
| Handle: | http://hdl.handle.net/11386/1059926 |
| Appare nelle tipologie: | 1.1.2 Articolo su rivista con ISSN |
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