Collisions of anisotropic two-dimensional bright solitons in dipolar Bose-Einstein condensates

TL;DR

This paper studies how anisotropic bright solitons in dipolar Bose-Einstein condensates collide, revealing breathing-mode excitations and analyzing the effects of phase and angular momentum on the collision dynamics.

Contribution

It introduces a combined approach using the extended Gross-Pitaevskii equation and variational methods to analyze soliton collisions in dipolar BECs, highlighting the impact of phase and angular momentum.

Findings

Collisions induce breathing-mode excitations in solitons.

Relative phase affects collision outcomes.

Angular momentum influences the collision dynamics.

Abstract

We investigate the coherent collision of anisotropic quasi-two-dimensional bright solitons in dipolar Bose-Einstein condensates. Our analysis is based on the extended Gross-Pitaevskii equation, and we use the split-operator method for the grid calculations and the time-dependent variational principle with an ansatz of coupled Gaussian functions to calculate the time evolution of the ground state. We compare the results of both approaches for collisions where initially the solitons are in the repelling side-by-side configuration and move towards each other with a specific momentum. We change the relative phases of the condensates, and introduce a total angular momentum by shifting the solitons in opposite direction along the polarization axis. Our calculations show that collisions result in breathing-mode-like excitations of the solitons.