Classical quasiparticle dynamics and chaos in trapped Bose condensates

TL;DR

This paper investigates how classical quasiparticle dynamics in trapped Bose-Einstein condensates lead to chaos, focusing on the effects of trap anisotropy and surface sharpness on resonance locations and chaotic behavior.

Contribution

It introduces a classical particle description of Bogoliubov quasiparticles in BECs and analyzes the emergence of chaos related to trap geometry and surface properties.

Findings

Resonance locations depend on trap anisotropy.

Chaos appears as quasiparticle energy approaches the chemical potential.

Surface sharpness influences the onset of chaotic dynamics.

Abstract

In the short wavelength limit the Bogoliubov quasiparticles of trapped Bose-Einstein condensates can be described as classical particles and antiparticles with dynamics in a mixed phase-space. For anisotropic parabolic traps we determine the location of the resonances and study the influence of the sharpness of the condensate surface on the appearance of chaos as the energy of the quasiparticles is lowered from values much larger than to values comparable with the chemical potential.