High-density limit of quasi-two-dimensional dipolar Bose gas

TL;DR

This paper analyzes the behavior of a quasi-two-dimensional dipolar Bose gas confined in a potential, focusing on the high-density limit to derive exact expressions for its excitations, ground-state energy, and phonon damping.

Contribution

It provides an exact analysis of low-lying excitations and ground-state properties of the dipolar Bose gas in the high-density limit using a hydrodynamic approach.

Findings

Exact structure of low-lying excitations derived

Ground-state energy and spectrum calculated in high-density limit

Damping rate of phonon mode at low temperature determined

Abstract

We consider a simple model of the quasi-two-dimensional dipolar Bose gas confined in the one-dimensional square well potential. All dipoles are assumed to be oriented along the confining axis. By means of hydrodynamic approach it is shown that the general structure of the low-lying excitations can be analyzed exactly. We demonstrate that the problem significantly simplifies in the high-density limit for which the density profile in the confined direction as well as the leading-order contribution to the ground-state energy and spectrum of elementary excitations are calculated. The low-temperature result for the damping rate of the phonon mode is also presented.