Generation of travelling sine-Gordon breathers in noisy long Josephson junctions

TL;DR

This paper demonstrates how to generate travelling sine-Gordon breathers in noisy long Josephson junctions using nonlinear supratransmission, controlled magnetic pulses, and explores noise effects on breather formation.

Contribution

It introduces a method to selectively generate Josephson breathers via magnetic pulses and analyzes noise influence on their generation probability.

Findings

Breather modes can be induced exclusively with magnetic pulses.

Breather-only generation probability varies nonmonotonically with noise.

An experimental protocol for observing Josephson breathers is proposed.

Abstract

The generation of travelling sine-Gordon breathers is achieved through the nonlinear supratransmission effect in a magnetically driven long Josephson junction, in the presence of losses, a current bias, and a thermal noise source. We demonstrate how to exclusively induce breather modes by means of controlled magnetic pulses. A nonmonotonic behavior of the breather-only generation probability is observed as a function of the noise intensity. An experimental protocol providing evidence of the Josephson breather's existence is proposed.