Magnetic solitons in an immiscible two-component Bose-Einstein condensate

TL;DR

This paper explores magnetic solitons in an immiscible two-component Bose-Einstein condensate, highlighting their unique properties, behaviors, and potential realization in Rb87 BEC systems.

Contribution

It introduces the concept of magnetic solitons in immiscible binary BECs and analyzes their properties, dynamics, and experimental feasibility.

Findings

Magnetic solitons resemble dark-bright solitons but differ in velocities, widths, and oscillations.

Low velocity magnetic solitons behave as magnetic domain walls.

Potential realization in quasi-1D Rb87 BEC with weak spin interactions.

Abstract

We investigate magnetic solitons in an immiscible binary Bose-Einstein condensate (BEC), where the intraspecies interactions are slightly weaker than the interspecies interactions. While their density and phase profiles are analogous to dark-bright solitons, other characteristic properties such as velocities, widths, total density depletions, and in-trap oscillations are different. In the low velocity regime, a magnetic soliton reduces to a traveling pair of magnetic domain walls. Collisional behaviors of the solitons are also briefly discussed. We further demonstrate that these solitonic states can be realized in a quasi-one-dimensional (quasi-1D) spin-1 ferromagnetic BEC with weak spin interaction, e.g., a Rb87 BEC.