Modeling rectification effects in mesoscopic superconducting devices

► Model: loop of weak links of RSJ+thermal fluctuations. Good agreement with diode effects measured in Al mesoscopic triangles. ► Prediction: amplitude of the rectified signal depends strongly on the current contacts configuration in triangle shaped SC. ► Key ingredients: field induced persistent cu...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2011-07, Vol.471 (13), p.432-436
Main Authors: Carusela, M.F., Ramunni, V.P., Marconi, V.I.
Format: Article
Language:English
Subjects:
Amplitudes
Asymmetry
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Diodes
Electric contacts
Exact sciences and technology
Fluctuation
Josephson junction arrays
Links
Mathematical models
Mesoscopic and nanoscale systems
Mesoscopic superconducting devices
Physics
Proximity effects, weak links, tunneling phenomena, and josephson effects, adreev effect, sn and sns junctions
Ratchet effect
Rectification
Superconducting films and low-dimensional structures
Superconductivity
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Summary:► Model: loop of weak links of RSJ+thermal fluctuations. Good agreement with diode effects measured in Al mesoscopic triangles. ► Prediction: amplitude of the rectified signal depends strongly on the current contacts configuration in triangle shaped SC. ► Key ingredients: field induced persistent currents and asymmetry induced by an off-center injection of external currents. ► Similar effects should be also present in every system with a persistent current and an asymmetric current path. ► Useful to design and control newer and smaller diode devices. We study thermal fluctuations and capacitive effects on small Josephson Junction Rings (JJR) that mimics the rectification phenomena recently observed in triangular shaped mesoscopic superconductors, due to the superposition of the field induced persistent current with the bias current. At finite temperature we predicted that the amplitude of the rectified signal depends strongly on the current contacts configuration on the JJR, in coincidence with experiments. In addition, we analyze the range of parameters where a closed loop of capacitive junctions is an appropriate model to explain the experimental observations. We conclude that the closed loop of weak links, a JJR, is a simple, robust and good model to explain the observed voltage rectification effects on mesoscopic superconducting samples for a wide range of temperature.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2011.04.008