Quasi-one-dimensional spin-orbit- and Rabi-coupled bright dipolar Bose-Einstein-condensate solitons

TL;DR

This paper investigates the formation and stability of bright solitons in quasi-one-dimensional dipolar Bose-Einstein condensates with spin-orbit and Rabi couplings, revealing novel ground states and phase diagrams.

Contribution

It introduces the existence of self-trapped bright solitons, including plane-wave and stripe types, in dipolar BECs with spin-orbit and Rabi couplings, highlighting conditions for their stability.

Findings

Existence of plane-wave and stripe solitons in dipolar BECs with SO and Rabi couplings

Identification of oscillatory instability leading to breather solutions

Phase diagram distinguishing PWS and SS regions

Abstract

We study the formation of stable bright solitons in quasi-one-dimensional (quasi-1D) spin-orbit- (SO-) and Rabi-coupled two pseudospinor dipolar Bose-Einstein condensates (BECs) of 164 Dy atoms in the presence of repulsive contact interactions. As a result of the combined attraction-repulsion effect of both interactions and the addition of SO and Rabi couplings, two kinds of ground states in the form of self-trapped bright solitons can be formed, a plane-wave soliton (PWS) and a stripe soliton (SS). These quasi-1D solitons cannot exist in a condensate with purely repulsive contact interactions and SO and Rabi couplings (no dipole). Neglecting the repulsive contact interactions, our findings also show the possibility of creating PWSs and SSs. When the strengths of the two interactions are close to each other, the SS develops an oscillatory instability indicating a possibility of a breather solution, eventually leading to its destruction. We also obtain a phase diagram showing regions where the solution is a PWS or SS.