The influence of the interaction between quasiparticles on parametric resonance in Bose-Einstein quasicondensates

TL;DR

This paper simulates how quasiparticle interactions at finite temperature affect atom pair production in Bose-Einstein quasicondensates, explaining experimental observations of limited pair creation and lack of number squeezing.

Contribution

It provides a detailed simulation showing the significant impact of quasiparticle interactions on parametric resonance in Bose-Einstein quasicondensates, a novel insight into the process.

Findings

Quasiparticle interactions significantly suppress pair production.

Finite temperature effects reduce number squeezing.

Simulation aligns with experimental observations.

Abstract

We perform a simulation of the experiment [1] where the temporal modification of the effective one dimensional interaction constant was used to create pairs of atoms with opposite velocities. The simulations clearly demonstrate huge impact of interaction between quasiparticles due to finite temperature on the pair production process, explaining relatively small atom pair production and the absence of the number squeezing in the experiment.