Peculiarities of phase dynamics of the Josephson junctions stack with the topologically nontrivial barriers

TL;DR

This paper investigates the unique phase dynamics of Josephson junction stacks with topologically nontrivial barriers, revealing features that could help experimentally identify Majorana fermions.

Contribution

It provides a comparative numerical analysis of phase dynamics in Josephson junction stacks with trivial and nontrivial barriers, highlighting distinctive features related to topological properties.

Findings

Minimum in breakpoint voltage dependence on dissipation parameter shifts with barrier topology.

Dependence of plasma wave frequency changes with dissipation affects resonance.

Features may enable experimental detection of Majorana fermions.

Abstract

The peculiarities of the phase dynamics of stacks of coupled Josephson junctions with topologically trivial and nontrivial barriers have been investigated numerically and their comparative analysis is carried out. The effect of coupling and dissipation parameters on the parametric resonance in the breakpoint region is shown. It is found that the dependence of the breakpoint voltage on the dissipation parameter demonstrates a minimum due to the changing of frequency of longitudinal plasma wave. We have shown that in case of the stack with nontrivial barriers the observed minimum shifts along the $\beta$ to the $\sqrt{2}$ in comparison with trivial barriers stack. We assume that the found features may be used for the experimental determination of Majorana fermions in the stack of JJs with the nontrivial barriers.