Nonuniversal beyond mean field properties of quasi-two-dimensional dipolar Bose gases

TL;DR

This paper investigates the beyond mean field effects in quasi-two-dimensional dipolar Bose gases, revealing nonuniversal corrections that influence the system's stability and roton behavior.

Contribution

It provides the first calculation of beyond mean field corrections in quasi-2D dipolar Bose gases, highlighting their dependence on high momentum interaction details.

Findings

Corrections are sensitive to high momentum interaction components.

Beyond mean field corrections are negative, adding an attractive term.

Enhancement of roton instability due to these corrections.

Abstract

We study a quasi-two dimensional gas of bosonic dipoles, calculating the beyond mean field corrections to the ground state energy and chemical potential neglecting the transverse mode structure. We show that the corrections are sensitive to the high momentum part of the interaction and cannot be expressed solely in terms of the scattering length and the dipole strength. While nonuniversal, the correction is found to be negative, which provides an additional attractive term in the extended Gross-Pitaevskii equation, enhancing the roton instability.