Asymmetrical solutions and role of thermal fluctuations in dc current driven extended Josephson junction

TL;DR

This paper investigates the dynamics of extended Josephson junctions under dc bias, revealing symmetrical and asymmetrical solutions, their stability, and the influence of thermal fluctuations on various motion modes.

Contribution

It introduces the existence of asymmetrical solutions and analyzes the role of thermal fluctuations in the junction's behavior, which was not previously detailed.

Findings

Symmetrical solutions form the main hysteretic IVC

Asymmetrical solutions create an additional IVC branch

Thermal fluctuations influence junction stability and dynamics

Abstract

Extended Josephson junction driven by dc bias current is studied numerically. Two types of solutions, symmetrical and asymmetrical, are found. The current-voltage characteristic (IVC) is calculated. The symmetrical solutions form main histeretic IVC and asymmetrical one create an additional branch. Depending on the bias current value periodic, quasiperiodic and chaotic modes of the junction motion was observed. Dynamics of the junction affected by thermal fluctuations was analyzed. Stability of different states of the junction is discussed.