Hitting a BEC with a comb: Evolution of interference patterns inside a magnetic trap

TL;DR

This paper investigates the dynamic evolution of Bose-Einstein condensates within a harmonic trap after release from an optical lattice, revealing interference patterns and collective motions that enhance understanding of quantum gases.

Contribution

It provides a physical model explaining the observed interference and motion patterns, advancing the analysis of BEC behavior in combined trapping potentials.

Findings

Observation of harmonic motion of interference peaks

Detection of breathing motion perpendicular to the lattice

Interpretation of dynamics through a simple physical model

Abstract

We study the evolution inside a harmonic trap of Bose-Einstein condensates released from the periodic potential of an optical lattice. After a time-of-flight, harmonic motion of the interference peaks is observed as well as a breathing motion in the direction perpendicular to the optical lattice. We interpret these results in terms of a simple physical model and discuss the possibility of more detailed studies of such a system.