Simulation of Collective Excitations in the Stack of Long Josephson Junctions

TL;DR

This paper investigates the phase dynamics of coupled long Josephson junctions, revealing a new collective excitation involving charge and fluxon states that impacts radiation power.

Contribution

It introduces the concept of a coexistence of charge traveling wave and fluxon states as a novel collective excitation in coupled Josephson junctions.

Findings

Coexistence of charge traveling wave and fluxon states observed.

This collective excitation decreases the radiation power.

IV-curve and dynamics of junctions analyzed.

Abstract

The phase dynamics of the stack of long Josephson junctions has been studied. Both inductive and capacitive couplings between Josephson junctions have been taken into account in the calculations. The IV--curve, bias current dependence of radiation power and dynamics of each JJs of the stack have been investigated. The coexistence of the charge traveling wave and fluxon states has been observed. This state can be considered as a new collective excitation in the system of coupled Josephson junctions. We demonstrate that the observed collective excitation leads to the decreasing of radiation power from the system.