Ferromagnetic Resonance in Spinor Dipolar Bose--Einstein Condensates

TL;DR

This paper investigates ferromagnetic resonance in spin-1 Bose--Einstein condensates with dipolar interactions, revealing shape-dependent resonance frequencies and spin currents driven by spin diffusion.

Contribution

It introduces a theoretical framework linking dipolar interactions in condensates to ferromagnetic resonance phenomena similar to condensed matter physics.

Findings

Resonance frequency depends on condensate shape

Dipolar interactions induce ferromagnetic resonance

Spin currents are driven by spin diffusion

Abstract

We used the Gross--Pitaevskii equations to investigate ferromagnetic resonance in spin-1 Bose--Einstein condensates with a magnetic dipole-dipole interaction. By introducing the dipole interaction, we obtained equations similar to the Kittel equations used to represent ferromagnetic resonance in condensed matter physics. These equations indicated that the ferromagnetic resonance originated from dipolar interaction, and that the resonance frequency depended upon the shape of the condensate. Furthermore, spin currents driven by spin diffusions are characteristic of this system.