Einstein--de Haas Effect in Dipolar Bose-Einstein Condensates

TL;DR

This paper explores the Einstein--de Haas effect in dipolar Bose-Einstein condensates, showing how spin-orbit interactions can induce vortex formation from an initially spin-polarized state.

Contribution

It demonstrates the dynamic generation of vortices in dipolar BECs due to spin-orbit interactions, linking quantum gases to ferromagnetic phenomena.

Findings

Spin-orbit interactions induce vortex formation.

Initial spin polarization leads to vortex dynamics.

The phenomenon resembles the Einstein--de Haas effect.

Abstract

The general properties of the order parameter for a dipolar spinor Bose-Einstein condensate are discussed based on symmetries of interactions. An initially spin-polarized dipolar condensate is shown to dynamically generate a non-singular vortex via spin-orbit interactions -- a phenomenon reminiscent of the Einstein--de Haas effect in ferromagnets.