Three-body and Coulomb interactions in a quasi two-dimensional dipolar Bose condensed gas

TL;DR

This study investigates how three-body contact and Coulomb interactions influence the properties of a quasi two-dimensional dipolar Bose-Einstein condensate, revealing effects like rotonization, instability, and temperature-dependent noncondensate fractions.

Contribution

It introduces a detailed numerical analysis of three-body and Coulomb effects on dipolar Bose gases using the Hartree-Fock-Bogoliubov-Popov approximation, highlighting new interaction-driven phenomena.

Findings

Three-body contact and Coulomb interactions induce rotonization.

These interactions cause condensate instability at higher dipole strengths.

Thermal noncondensate fraction varies linearly with temperature at low temperatures.

Abstract

In this paper, we studied a dilute quasi two-dimensional dipolar Bose-condensed with two- and three-body contact, and Coulomb interactions using the Hartree-Fock-Bogoliubov-Popov approximation. We analyze numerically the effects of three-body contact, and Coulomb interactions on the energy spectrum, the quantum and thermal noncondensate fraction of the system. We show that increasing the three-body contact and Coulomb interactions leads to the appearance of rotonization and condensate instability at stronger dipole-dipole interaction. Also we find that the temperature dependence of the thermal noncondensate fraction is linear at low temperature.