Two-component gap solitons with linear interconversion

TL;DR

This paper investigates one-dimensional two-component Bose-Einstein condensate solitons with linear interconversion, exploring symmetry breaking and spatial splitting effects using variational approximation and numerical simulations.

Contribution

It introduces analysis of symmetry breaking and spatial splitting in two-component BEC solitons with linear coupling in an optical lattice, combining variational and numerical methods.

Findings

Symmetry breaking occurs in symmetric and antisymmetric solitons.

Spatial splitting between components is observed.

Both repulsive and attractive interactions are considered.

Abstract

We consider one-dimensional solitons in a binary Bose-Einstein condensate with linear coupling between the components, trapped in an optical-lattice potential. The inter-species and intra-species interactions may be both repulsive or attractive. Main effects considered here are spontaneous breaking of the symmetry between components in symmetric and antisymmetric solitons, and spatial splitting between the components. These effects are studied by means of a variational approximation and numerical simulations.