How to observe dipolar effects in spinor Bose-Einstein condensates

TL;DR

This paper investigates how dipolar interactions influence spinor Bose-Einstein condensates under oscillating magnetic fields, revealing resonances that enable observation of the Einstein-de Haas effect in alkali gases.

Contribution

It demonstrates the presence of dipolar-induced resonances in spinor condensates, facilitating the experimental observation of dipolar effects like the Einstein-de Haas effect.

Findings

Resonances magnify atom transfer between Zeeman sublevels due to dipolar interactions.

Resonances occur at milligauss magnetic fields and are broad enough for experimental detection.

Observation of the Einstein-de Haas effect in alkali gases is feasible with these resonances.

Abstract

We study a spinor condensate of alkali atoms in F = 1 hyperfine state under the presence of an oscillating magnetic field. We find resonances which, due to the dipolar interactions, magnify the transfer of atoms from mF = 1 to mF = 0 Zeeman sublevel. These resonances occur at magnetic fields of the order of milligaus and are broad enough to enable observation of the famous Einstein-de Haas effect, which is solely a dipolar effect, in systems of cold alkali gases.