Role of quasiparticles in the growth of a trapped Bose-Einstein condensate

TL;DR

This paper extends a condensate growth model to include quasiparticle dynamics, revealing that their evolution accelerates the growth rate of a trapped Bose-Einstein condensate by nearly tenfold.

Contribution

It introduces a comprehensive model incorporating quasiparticle occupations and higher trap levels, providing a more accurate description of condensate growth.

Findings

Growth rate increases by less than an order of magnitude due to quasiparticles.

Quasiparticle evolution significantly impacts condensate formation dynamics.

The model's predictions depend on scattering and transition rate assumptions.

Abstract

A major extension of the model of condensate growth introduced by us is made to take account of the evolution of the occupations of lower trap levels (quasiparticles) by scattering processes, and of the full Bose-Einstein formula for the occupations of higher trap levels, which are assumed to have a time independent occupation. The principal effect is a speedup of the growth rate by somewhat less than an order of magnitude, the precise value depending on the the assumptions made on scattering and transition rates for the quasiparticle levels.