Characterization of the stimulated excitation in a driven Bose-Einstein condensate

TL;DR

This paper uses the time-dependent generalized Hartree-Fock-Bogoliubov theory to analyze stimulated excitations in a driven Bose-Einstein condensate, highlighting the importance of excited mode interactions.

Contribution

It introduces a detailed theoretical approach that improves understanding of stimulated excitations and density wave propagation in driven BECs.

Findings

Interaction terms from excited modes are crucial for dynamics.

The model explains second harmonic generation.

Density wave propagation is clearly described.

Abstract

We apply the time-dependent generalized Hartree-Fock-Bogoliubov (td-GHFB) theory to describe the stimulated excitation driven by periodically modulating the interactions in a Bose-Einstein condensate (BEC). A comparison with the results calculated from the typical Bogoliubov approximation indicates that the additional interaction terms contributed by the excited modes play a significant role to explain the dynamics of the stimulating process. The td-GHFB model has not only painted a clear picture of the density wave propagation, but also partly explained the generation of the second order harmonic of the excited modes. The theoretical framework can be directly employed to study similar driven processes.