• DOI:10.21468/SciPostPhys.5.5.043
• Corpus ID: 55864337

Cooling phonon modes of a Bose condensate with uniform few body losses

@article{Bouchoule2018CoolingPM,
  title={Cooling phonon modes of a Bose condensate with uniform few body losses},
  author={I. Bouchoule and Maximilian Schemmer and Carsten Henkel},
  journal={SciPost Physics},
  year={2018}
}

• I. Bouchoule, M. Schemmer, C. Henkel
• Published 22 June 2018
• Physics
• SciPost Physics

We present a general analysis of the cooling produced by losses on
condensates or quasi-condensates. We study how the occupations of the
collective phonon modes evolve in time, assuming that the loss process
is slow enough so that each mode adiabatically follows the decrease of
the mean density. The theory is valid for any loss process whose rate is
proportional to the jjth
power of the density, but otherwise spatially uniform. We cover both
homogeneous gases and systems confined in a smooth potential. For a
low-dimensional gas, we can take into account the modified equation of
state due to the broadening of the cloud width along the tightly
confined directions, which occurs for large interactions. We find that
at large times, the temperature decreases proportionally to the energy
scale mc^2mc2,
where mm
is the mass of the particles and cc
the sound velocity. We compute the asymptotic ratio of these two
quantities for different limiting cases: a homogeneous gas in any
dimension and a one-dimensional gas in a harmonic trap.