Diminished quantum depletion and correlated droplets in one-dimensional dipolar Bose gas

TL;DR

This study explores how strong interactions in a one-dimensional dipolar Bose gas can reduce quantum depletion, enabling the Bogoliubov de-Gennes method to accurately predict properties of self-bound states and correlated droplets.

Contribution

It reveals a regime where strong interactions mitigate quantum depletion, restoring BdG method validity in a system with pronounced anti-bunching, supported by comparison with exact calculations.

Findings

Quantum depletion is significantly reduced in certain strongly interacting regimes.

BdG method accurately predicts ground-state energy and correlations in these regimes.

Tuning dipole polarization controls the transition between different interaction regimes.

Abstract

We investigate the formation of self-bound states in a one-dimensional dipolar Bose gas under the influence of both strong short-range repulsive and strong non-local attractive interactions. While conventional methods like the Bogoliubov de-Gennes (BdG) method typically fail in regimes with strong interactions due to significant quantum depletion, we reveal a particular scenario where the interplay of these strong interactions significantly mitigates quantum depletion, thus restoring the applicability of the BdG method. Remarkably, this restoration occurs even though the system exhibits pronounced anti-bunching, a feature usually linked with strongly correlated systems. By comparing our BdG results with exact ab initio calculations, we confirm the accuracy of the BdG approach in predicting the ground-state energy and correlation functions under these conditions. Furthermore, we demonstrate that adjusting the polarization direction of the dipoles allows for a tunable transition between a strongly interacting regime and the novel balanced regime explored in this research.