Two dimensional bright solitons in dipolar Bose-Einstein condensates with tilted dipoles

TL;DR

This paper explores how tilting the dipoles in a 2D dipolar Bose-Einstein condensate affects soliton stability and anisotropy, revealing new regimes and methods to induce phonon instability and create self-trapped states.

Contribution

It introduces the tilting angle as a new control parameter for 2D dipolar solitons, enabling access to novel regimes and dynamic manipulation of condensate stability.

Findings

Tilting angle controls in-plane anisotropy of solitons.

Tilted dipoles can induce phonon instability without changing interactions.

Adiabatic tuning of tilt creates self-trapped matter waves.

Abstract

The effect of dipolar orientation with respect to the soliton plane on the physics of two-dimensional bright solitons in dipolar Bose-Einstein condensates is discussed. Previous studies on such a soliton involved dipoles either perpendicular or parallel to the condensate-plane. The tilting angle constitutes an additional tuning parameter, which help us to control the in-plane anisotropy of the soliton as well as provides access to previously disregarded regimes of interaction parameters for soliton stability. In addition, it can be used to drive the condensate into phonon instability without changing its interaction parameters or trap geometry. The phonon-instability in a homogeneous 2D condensate of tilted dipoles always features a transient stripe pattern, which eventually breaks into a metastable soliton gas. Finally, we demonstrate how a dipolar BEC in a shallow trap can eventually be turned into a self-trapped matter wave by an adiabatic approach, involving the tuning of tilting angle.