Soliton collisions in Bose-Einstein condensates with current-dependent interactions

TL;DR

This paper investigates the collision dynamics of chiral solitons in Bose-Einstein condensates with current-dependent interactions, revealing inelastic behaviors, amplitude reduction, and effects of harmonic confinement through analytical and numerical methods.

Contribution

It introduces a detailed analysis of chiral soliton collisions considering current-dependent interactions, highlighting new inelastic and amplitude reduction phenomena.

Findings

Collisions exhibit inelastic and interference effects.

Amplitude reduction occurs during chiral soliton interactions.

Harmonic confinement influences soliton emergence and interactions.

Abstract

We study general collisions between chiral solitons in Bose-Einstein condensates subject to combined attractive and current-dependent interatomic interactions. A simple analysis based on the linear superposition of the solitons allows us to determine the relevant time and space scales of the dynamics, which is illustrated by extensive numerical simulations. By varying the differential amplitude, the relative phase, the average velocity, and the relative velocity of the solitons, we characterize the different dynamical regimes that give rise to oscillatory and interference phenomena. Apart from the known inelastic character of the collisions, we show that the chiral dynamics involves an amplitude reduction with respect to the case of regular solitons. To compare with feasible ultracold gas experiments, the influence of harmonic confinement is analyzed in both the emergence and the interaction of chiral solitons.