The Role of Vortices in the Mutual Coupling of Superconducting and Normal-Metal Films

TL;DR

This paper proposes that vortices in superconducting films cause mutual coupling with normal-metal films, explaining a sharp peak near the superconducting transition and addressing non-reciprocal effects observed in trilayers.

Contribution

It introduces a vortex-based mechanism for the mutual coupling in metal-insulator-metal trilayers, providing an alternative to Coulomb interactions and explaining non-reciprocal cross-talk effects.

Findings

Vortices induce local fluctuating electric fields affecting neighboring films.

The proposed model matches the magnitude and shape of observed peaks.

Addresses non-reciprocity in film interactions.

Abstract

I propose a possible explanation to a recently observed ``cross-talk'' effect in metal-insulator-metal trilayers, indicating a sharp peak near a superconducting transition in one of the metal films. Coulomb interactions are excluded as a dominant coupling mechanism, and an alternative is suggested, based on the local fluctuating electric field induced by mobile vortices in the superconducting layer. This scenario is compatible with the magnitude of the peak signal and its shape; most importantly, it addresses the {\it non-reciprocity} of the effect in exchanging the roles of the films.