Dipolar Drag in Bilayer Harmonically Trapped Gases

TL;DR

This paper investigates how dipolar interactions influence the transfer of center of mass motion between two separated, trapped gases, analyzing the dynamics across different quantum regimes and interaction strengths.

Contribution

It provides a detailed analysis of dipolar-induced center of mass dynamics in bilayer gases, including dependence on interaction strength and separation, covering Fermi and Bose-Einstein gases.

Findings

Frequency difference depends on dipolar strength and separation.

Long-range dipolar interactions enable motion transfer between clouds.

Results applicable to both degenerate and classical gases.

Abstract

We consider two separated pancake-shaped trapped gases interacting with a dipolar (either magnetic or electric) force. We study how the center of mass motion propagates from one cloud to the other as a consequence of the long-range nature of the interaction. The corresponding dynamics is fixed by the frequency difference between the in-phase and the out-of-phase center of mass modes of the two clouds, whose dependence on the dipolar interaction strength and the cloud separation is explicitly investigated. We discuss Fermi gases in the degenerate as well as in the classical limit and comment on the case of Bose-Einsten condensed gases.