Profile and Crowding of Currents in Mesoscopic Superconductors with an Array of Antidots

TL;DR

This paper investigates how the arrangement of antidots in mesoscopic superconductors influences current distribution and vortex penetration, using time-dependent Ginzburg-Landau theory to reveal effects of geometry on critical currents.

Contribution

It demonstrates the impact of antidot geometry on current crowding and vortex behavior in mesoscopic superconductors, providing insights into device design.

Findings

Current intensity increases at antidot vertices.

Smaller systems with closer antidots show more affected current profiles.

Antidot arrangement influences vortex penetration and flux morphology.

Abstract

Studies with mesoscopic superconducting materials have made significant advances on the last decades. One of the applications of such systems is in devices for single photon and single electron detectors. However, depending on the geometry of these systems, crowding current effects take place and, as a consequence, the total critical current could decrease which facilitates the penetration of vortices. This effect could also be responsible for a variety of penetration morphologies of flux avalanches in macroscopic samples. Thus, in this work we used the time-dependent Ginzburg-Landau theory to study the crowding current effects in mesoscopic superconducting systems with an array of antidots. It is demonstrated that the profile of the currents is influenced by the antidots, i.e., in the vertices of the antidots the intensity of the currents increases. On the other hand, the profile of the currents in between the antidots is more affected in the smaller system which presents closer antidots.