Modeling Voltage Rectification Effects On Mesoscopic Superconducting Devices

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

Buenos Aires

Congreso; At de Frontiers of Condensed Mater - New Trends and Materials; 2010

Depto. de Física Tandar CNEA

We study thermal fluctuations and capacitive effects on small Joseph-son Junction Rings (JJR) that mimics the rectification phenomena recentlyobserved in triangular shaped mesoscopic superconductors, due to the super-position of the field induced persistent current with the bias current. At finitetemperature we predicted that the amplitude of the rectified signal dependsstrongly on the current contacts configuration on the JJR, in coincidencewith experiments. In addition, we analize the range of parameters where aclosed loop of capacitive junctions is an appropriate model to explain theexperimental observations. We conclude that the closed loop of weak links,a JJR, is a simple, robust and good model to explain the observed voltagerectification effects on mesoscopic superconducting samples for a wide rangeof temperature.