Abstract
We have verified experimentally that the zero-voltage state of a hysteretic dc SQUID is in general not unique, but corresponds instead to several metastable flux states. The existence of this multiplicity is a direct consequence of the two-dimensional nature of the dc SQUID dynamics. For a fixed external magnetic flux, each zero-voltage substate is characterized by a particular value of critical current. Experimentally, the multiplicity of substates manifested itself by the existence of several peaks in the switching current distribution. Each peak could be assigned to a certain zero voltage substate. We have measured the dependence of the associated critical currents on the external magnetic flux. We have also developed a procedure which allows the selection of any one of the zero-voltage substates.
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© 1992 Springer-Verlag Berlin Heidelberg
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Lefevre-Seguin, V., Turlot, E., Urbina, C., Esteve, D., Devoret, M.H. (1992). Selection of One of the Different Zero-Voltage States of a Hysteretic DC SQUID. In: Koch, H., Lübbig, H. (eds) Single-Electron Tunneling and Mesoscopic Devices. Springer Series in Electronics and Photonics, vol 31. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-77274-0_23
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DOI: https://doi.org/10.1007/978-3-642-77274-0_23
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