Phase dynamics and IV-characteristics of two parallel stacks of coupled Josephson junctions

TL;DR

This paper investigates the phase dynamics and IV-characteristics of two parallel stacks of coupled Josephson junctions, revealing how coupling affects their electrical behavior and potential applications in superconducting devices.

Contribution

It provides a detailed analysis of phase dynamics, current behavior, and the impact of symmetry in coupled Josephson junction stacks, highlighting new insights into their IV-characteristics.

Findings

Coupling causes branching and reduces hysteresis in IV-characteristics.

Diffusion current plays a crucial role in IV-characteristic formation.

Symmetry decreases the branching in the IV-characteristics.

Abstract

Two parallel stacks of coupled Josephson junctions are investigated to clarify the physics of transitions between the rotating and oscillating states and their effect on the IV-characteristics of the system. The detailed study of phase dynamics and bias dependence of the superconducting and diffusion currents allows one to explain all features of simulated IV-characteristics and demonstrate the correspondence in their behavior. The coupling between JJ in the stacks leads to the branching of IV-characteristics and a decrease in the hysteretic region. The crucial role of the diffusion current in the formation of the IV-characteristic of the parallel stacks of coupled Josephson junctions is demonstrated. We discuss the effect of symmetry in a number of junctions in the stacks and show a decrease of the branching in the symmetrical stacks. The observed effects might be useful for development of superconducting electronic devices based on intrinsic Josephson junctions.