Josephson penetration depth in coplanar junctions based on 2D materials

Abstract

Josephson junctions and SQUIDs with graphene or other 2D materials as the weak link between superconductors have become a hot topic of research in recent years, with respect to both fundamental physics and potential applications. We have previously reported ultra-wide Josephson junctions (up to 80 μm wide) based on CVD graphene where the critical current was found to be uniformly distributed in the direction perpendicular to the current. In this paper, we demonstrate that the unusually large Josephson penetration depth that this corresponds to is enabled by the unique geometric structure of Josephson junctions based on 2D materials. We derive a new expression for the Josephson penetration depth of such junctions and verify our assumptions by numerical simulations.

Pair Correlation Influence on Superconductors Josephson Penetration Depth

“…The developed equation in methodology section EQUATION ( 14) and EQUATION ( 9) and to study the nature of developed equation was computed using MATLAB and for this data form [26][27][28] and study the nature of JPD with temperature and with fermi velocity as shown in FIGURE 1 and 2 respectively. The nature of Josephson penetration Depth (JPD) to electronphonon and transition temperature in FIGURE 1 shoes that JPD decrease with increasing temperature.…”

“…Recent research has focused on Josephson junctions and superconducting quantum interference devices (SQUIDs) utilizing graphene or other 2D materials as weak links, with applications in both fundamental physics and potential technologies [26]. Ultrawide Josephson junctions based on chemical-vapor-deposition graphene have shown uniform critical current distribution.…”