1D model for the dynamics and expansion of elongated Bose-Einstein condensates

TL;DR

This paper introduces a 1D effective model to describe the dynamics and expansion of elongated Bose-Einstein condensates in time-dependent harmonic potentials, validated against experiments and exploring negative-mass effects.

Contribution

The paper develops a simplified 1D model for cigar-shaped BECs in dynamic potentials, enabling efficient analysis of their expansion and dynamics in optical lattices.

Findings

Model accurately predicts condensate expansion in optical lattices

Experimental data supports the model's validity

Negative-mass effects are theoretically discussed

Abstract

We present a 1D effective model for the evolution of a cigar-shaped Bose-Einstein condensate in time dependent potentials whose radial component is harmonic. We apply this model to investigate the dynamics and expansion of condensates in 1D optical lattices, by comparing our predictions with recent experimental data and theoretical results. We also discuss negative-mass effects which could be probed during the expansion of a condensate moving in an optical lattice.