Multicomponent condensates: a flexible platform for soliton physics

TL;DR

This paper explores binary Bose-Einstein condensate mixtures near the miscibility threshold, demonstrating their dynamics can be simplified to a single nonlinear equation and enabling studies of solitons and other nonlinear phenomena.

Contribution

It introduces a versatile platform using multicomponent condensates to study soliton physics and nonlinear equations beyond the standard nonlinear Schrödinger framework.

Findings

Demonstrated stable solitonic solutions in 1D and 2D

Reduced complex mixture dynamics to a single nonlinear equation

Enabled exploration of equations like the Landau-Lifshitz in condensates

Abstract

We present a series of experimental investigations on binary mixtures of Bose-Einstein condensates. Our focus lies on the regime where the interaction parameters place the system at the threshold of miscibility. We demonstrate that the dynamics of such mixtures can be effectively reduced to a single nonlinear equation. This framework is illustrated through the discussion of stable solitonic solutions in one and two dimensions. Furthermore, we show that employing a binary mixture enables exploration beyond the dynamics governed by the nonlinear Schr\"odinger equation, allowing us to address other fundamental equations in nonlinear physics, such as the Landau-Lifshitz equation describing the motion of spin chains in ferromagnetic materials.