Charge creation and nucleation of longitudinal plasma wave in coupled Josephson junctions

TL;DR

This paper investigates the phase dynamics and charge creation in coupled Josephson junctions, analyzing how longitudinal plasma waves nucleate and evolve, with implications for controlling these processes via external influences.

Contribution

It provides detailed numerical simulations of charge creation and LPW nucleation, establishing links between experimental observables and the underlying charge dynamics in coupled Josephson junctions.

Findings

Identification of different stages in LPW development

Correlation between breakpoint on CVC and charge growth

Effects of noise and microwave radiation on charge dynamics

Abstract

We study the phase dynamics in coupled Josephson junctions describing by system of nonlinear differential equations. Results of detailed numerical simulations of charge creation in the superconducting layers and the longitudinal plasma wave (LPW) nucleation are presented. We demonstrate the different time stages in the development of the LPW and present results of FFT analysis at different values of bias current. The correspondence between the breakpoint position on the outermost branch of current voltage characteristics (CVC) and the growing region in time dependence of the electric charge in the superconducting layer is established. The effects of noise in the bias current and the external microwave radiation on the charge dynamics of the coupled Josephson junctions are found. These effects introduce a way to regulate the process of LPW nucleation in the stack of IJJ.