Dipolar Stabilization of an Attractive Bose Gas in a One Dimensional Lattice

TL;DR

This paper demonstrates experimentally that dipolar interactions can stabilize an attractive Bose gas in a one-dimensional lattice, with the stabilization depending on lattice depth and confirmed by theoretical models.

Contribution

It provides the first experimental evidence of dipolar stabilization of an attractive Bose gas in a lattice, highlighting the role of inter-site interactions.

Findings

Dipolar interactions stabilize the Bose gas up to -17 Bohr radii.

Stability depends on lattice depth, with stabilization at higher depths and destabilization at lower depths.

Experimental results agree well with theoretical predictions.

Abstract

We experimentally show that dipolar interaction can stabilize otherwise unstable many-body systems like an attractive Bose gas. In a one dimensional lattice the repulsive dipolar on-site interaction balances negative scattering lengths up to -17 Bohr radii and stabilizes the chromium Bose-Einstein condensate. For reduced lattice depths, the dipolar stabilization turns into destabilization. We probe the full cross-over between the two regimes and our results are in excellent agreement with theoretical calculations, which reveal significant dipolar inter-site interactions.