Modeling Rectification Effects in Mesoscopic Superconducting Devices

TL;DR

This paper models how thermal fluctuations and capacitive effects influence rectification phenomena in mesoscopic superconducting devices, specifically Josephson Junction Rings, aligning theoretical predictions with experimental observations.

Contribution

It introduces a simple, robust model of Josephson Junction Rings to explain voltage rectification effects in mesoscopic superconductors across various temperatures.

Findings

Rectified signal amplitude depends on contact configuration.

Closed loop of capacitive junctions effectively models experimental results.

Model remains valid over a wide temperature range.

Abstract

We study thermal fluctuations and capacitive effects on small Josephson Junction Rings (JJR) that mimics the rectification phenomena recently observed in triangle 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 enough model to explain the observed voltage rectification effects on mesoscopic superconducting samples for a wide range of temperature.