Rebound-through transition of bright-bright solitons collision in two species condensates with repulsive interspecies interactions

TL;DR

This paper investigates the collision dynamics of bright-bright solitons in two-species Bose-Einstein condensates with repulsive interspecies interactions, revealing a transition from rebound to through-collision influenced by initial velocities and positions.

Contribution

It introduces the observation of through-collision in bright-bright solitons and analyzes how initial conditions modulate their interaction types in two-species condensates.

Findings

Interactions vary from repulsive to attractive with separation distance.

Bright-bright solitons can be localized at equilibrium positions.

A new through-collision phenomenon is observed at higher initial velocities.

Abstract

We study the dynamical properties of bright-bright solitons in two species Bose-Einstein condensates with the repulsive interspecies interactions under the external harmonic potentials by using a variational approach combined with numerical simulation. It is found that the interactions between bright-bright solitons vary from repulsive to attractive interactions with the increasing of their separating distances. And the bright-bright solitons can be localized at equilibrium positions, different from the periodic oscillation of bright soliton in the single species condensates. Especially, a through-collision is newly observed from the bright-bright solitons collisions with the increasing of the initial velocity. The collisional type of bright-bright solitons, either rebound - or through -collision, depends on the modulation of the initial conditions. These results will be helpful for the experimental manipulating such solitons.