Modeling Rectification Effects in Mesoscopic Superconducting Devices

M.F. CARUSELA; V. P. RAMUNNI; V. I. MARCONI

PHYSICA C - SUPERCONDUTIVITY

ELSEVIER SCIENCE BV

Año: 2011 p. 1 - 16

0921-4534

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 analize 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. Key words: ratchet effect, mesoscopic superconducting devices, Josephson junction arrays