Shape oscillation of a rotating Bose-Einstein condensate

TL;DR

This paper investigates how the shape oscillation (monopole mode) of a rapidly rotating Bose-Einstein condensate is affected by a weak quartic potential, combining theoretical and experimental approaches to explore fast rotation dynamics.

Contribution

It provides a combined theoretical and experimental analysis of the monopole mode in a fast rotating BEC with a non-harmonic potential, highlighting the influence of the quartic confinement.

Findings

The non-harmonic potential significantly alters the mode frequency.

The monopole mode serves as a precise probe for fast rotation regimes.

Experimental results confirm theoretical predictions.

Abstract

We present a theoretical and experimental analysis of the transverse monopole mode of a fast rotating Bose-Einstein condensate. The condensate's rotation frequency is similar to the trapping frequency and the effective confinement is only ensured by a weak quartic potential. We show that the non-harmonic character of the potential has a clear influence on the mode frequency, thus making the monopole mode a precise tool for the investigation of the fast rotation regime.