Vortex-bright solitons in a spin-orbit-coupled spin-1 condensate

Sandeep Gautam and S. K. Adhikari
Phys. Rev. A 95, 013608 – Published 9 January 2017

Abstract

We study the vortex-bright solitons in a quasi-two-dimensional spin-orbit-coupled (SO-coupled) hyperfine spin-1 three-component Bose-Einstein condensate using variational method and numerical solution of a mean-field model. The ground state of these vortex-bright solitons is radially symmetric for weak ferromagnetic and polar interactions. For a sufficiently strong ferromagnetic interaction, we observe the emergence of an asymmetric vortex-bright soliton as the ground state. We also numerically investigate stable moving solitons and binary collision between them. The present mean-field model is not Galilean invariant, and we use a Galilean-transformed model for generating the moving solitons. At low velocities, the head-on collision between two in-phase solitons results either in collapse or fusion of the soliton pair. On the other hand, in head-on collision, the two out-of-phase solitons strongly repel each other and trace back their trajectories before the actual collision. At low velocities, in a collision with an impact parameter, the out-of-phase solitons get deflected from their original trajectory like two rigid classical disks. These out-of-phase solitons behave like classical disks, and their collision dynamics is governed by classical laws of motion. However, at large velocities two SO-coupled spinor solitons, irrespective of phase difference, can pass through each other in a head-on collision like two quantum solitons.

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  • Received 4 July 2016
  • Revised 5 October 2016

DOI:https://doi.org/10.1103/PhysRevA.95.013608

©2017 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Sandeep Gautam* and S. K. Adhikari

  • Instituto de Física Teórica, Universidade Estadual Paulista–UNESP, 01.140-070 São Paulo, São Paulo, Brazil

  • *sandeepgautam24@gmail.com
  • adhikari44@yahoo.com; URL http://www.ift.unesp.br/users/adhikari

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Issue

Vol. 95, Iss. 1 — January 2017

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