Collective modes of a quasi two-dimensional Bose condensate in large gas parameter regime

TL;DR

This paper investigates how higher-order interaction effects, specifically the Lee, Huang and Yang correction, influence the collective excitation modes of a quasi two-dimensional Bose condensate in the large gas parameter regime.

Contribution

It introduces a theoretical approach that includes beyond-mean-field corrections to analyze collective modes in Q2D Bose condensates, revealing measurable frequency shifts.

Findings

Higher order interaction terms modify mode frequencies.

Inclusion of LHY correction leads to detectable changes.

The formalism extends understanding of strongly interacting Bose gases.

Abstract

We have theoretically studied the collective modes of a quasi two-dimensional (Q2D) Bose condensate in the large gas parameter regime by using a formalism which treats the interaction energy beyond the mean-field approximation. In the calculation we use the perturbative expansion for the interaction energy by incorporating the Lee, Huang and Yang (LHY) correction term. The results show that incorporation of this higher order term leads to detectable modifications in the mode frequencies.