Stability of quasi-two-dimensional Bose-Einstein condensates with dominant dipole-dipole interactions

TL;DR

This paper demonstrates that quasi-two-dimensional Bose-Einstein condensates with dominant dipole-dipole interactions remain stable without unstable excitation spectra, due to dimensional reduction effects within mean-field theory.

Contribution

It shows that in quasi-two-dimensional BECs, dominant dipole-dipole interactions do not lead to instability, contrary to expectations, within a mean-field framework.

Findings

Condensates remain stable despite dominant dipole interactions

Dimensional reduction suppresses instability

Mean-field theory confirms stability

Abstract

We consider quasi-two-dimensional atomic/molecular Bose-Einstein condensates with both contact and dipole-dipole interactions. It is shown that, as a consequence of the dimensional reduction, and within mean-field theory, the condensates do not develop unstable excitation spectra, even when the dipole-dipole interaction completely dominates the contact interaction.