The c-axis charge traveling wave in coupled system of Josephson junctions

TL;DR

This paper investigates the charge traveling wave along the c-axis in coupled Josephson junctions within high-temperature superconductors, revealing multiple wave branches and their transitions, with proposals for experimental verification.

Contribution

It demonstrates the existence of charge traveling waves in coupled Josephson junctions and characterizes their behavior and transitions in the current-voltage characteristics.

Findings

Multiple charge traveling wave branches are identified.

Transitions between wave branches and the outermost branch are observed.

Different charge dynamics are found in various branches.

Abstract

We demonstrate a manifestation of the charge traveling wave along the c-axis (TW) in current voltage characteristics of coupled Josephson junctions in high-$T_c$ superconductors. The branches related to the TW with different wavelengths are found for the stacks with different number of Josephson junctions at different values of system's parameters. Transitions between the TW branches and the outermost branch are observed. Time dependence of the electric charge in the superconducting layers and charge-charge correlation functions for TW and outermost branches show different behavior with bias current. We propose an experimental testing of the TW by microwave irradiation.