Study of charge density waves generated in strongly coupled highly dissipative Josephson junctions arrays

Abstract

Strongly coupled, highly dissipative arrays of Josephson junctions are characterized by presence of two branches for the currents greater then the critical one in their IV characteristic. Additional branch, called traveling wave branch is characterized by low voltage, generation of charge density waves in the stack. Traveling wave branch appears on the IV characteristic only if coupling and dissipation parameters have the values above their thresholds. In this work we focused on the study of charge density waves behavior in the specified type of Josephson junction arrays in order to explain the stability of the traveling wave branch. Were performed numerical simulations using Capacity Coupled Josephson Junctions with Diffusion Current (CCJJ+DC) model which gives good agreement with the experimental results and were obtained IV-characteristics and charge density temporal evolution profiles for different currents corresponding to traveling wave branch. Was shown that the form of charge density waves changes with the increase of current. Moreover was studied spectral structure of charge density waves and dependence of Lissajous correlations between charge accumulated on the neighbor superconducting layers on the current. thought the stack.