Effect of coupling between junctions on superconducting current and charge correlations in intrinsic Josephson junctions

TL;DR

This paper explores how coupling effects between junctions influence superconducting currents and charge correlations in intrinsic Josephson junctions, revealing new features in their current-voltage behavior.

Contribution

It introduces a correlation function-based method to analyze current-voltage characteristics, highlighting differences between harmonic and chaotic behaviors in the system.

Findings

Charge autocorrelation functions distinguish harmonic from chaotic behavior.

Correlation analysis predicts additional features in I-V characteristics.

Method provides a new tool for studying coupled Josephson junctions.

Abstract

Charge formations on superconducting layers and creation of the longitudinal plasma wave in the stack of intrinsic Josephson junctions change crucially the superconducting current through the stack. Investigation of the correlations of superconducting currents in neighboring Josephson junctions and the charge correlations in neighboring superconducting layers allows us to predict the additional features in the current--voltage characteristics. The charge autocorrelation functions clearly demonstrate the difference between harmonic and chaotic behavior in the breakpoint region. Use of the correlation functions gives us a powerful method for the analysis of the current--voltage characteristics of coupled Josephson junctions.