Properties of strongly dipolar Bose gases beyond the Born approximation

TL;DR

This paper investigates how corrections beyond the Born approximation affect the properties of strongly dipolar Bose gases, impacting collective modes and stability, with relevance to recent experiments on erbium and dysprosium.

Contribution

It derives a modified pseudopotential incorporating realistic interactions, improving the theoretical description of dipolar Bose gases beyond the Born approximation.

Findings

Corrections beyond the Born approximation modify collective mode frequencies.

The stability diagram of dipolar droplets is affected by these corrections.

Results are applicable to recent experiments with erbium and dysprosium atoms.

Abstract

Strongly dipolar Bose gases can form liquid droplets stabilized by quantum fluctuations. In theoretical description of this phenomenon, low energy scattering amplitude is utilized as an effective potential. We show that for magnetic atoms corrections with respect to Born approximation arise, and derive modified pseudopotential using realistic interaction model. We discuss the resulting changes in collective mode frequencies and droplet stability diagram. Our results are relevant for recent experiments with erbium and dysprosium atoms.