Novel soliton in dipolar BEC caused by the quantum fluctuations

TL;DR

This paper introduces a new bright soliton solution in dipolar Bose-Einstein condensates, driven by quantum fluctuations, which persists even with repulsive short-range interactions, expanding understanding of nonlinear excitations in quantum gases.

Contribution

It presents the first large amplitude bright soliton solution caused by quantum fluctuations in dipolar BECs, incorporating a comprehensive hydrodynamic model with higher-rank tensor evolution equations.

Findings

Bright soliton caused by quantum fluctuations identified

Soliton exists with repulsive short-range interactions

Model includes advanced tensor evolution equations

Abstract

Solitons in the extended hydrodynamic model of the dipolar Bose-Einstein condensate with quantum fluctuations are considered. This model includes the continuity equation for the scalar field of concentration, the Euler equation for the vector field of velocity, the pressure evolution equation for the second rank tensor of pressure, and the evolution equation for the third rank tensor. Large amplitude soliton solution caused by the dipolar part of quantum fluctuations is found. It appears as the bright soliton. Hence, it is the area of compression of the number of particles. Moreover, it exists for the repulsive short-range interaction.