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Cooling phonon modes of a Bose condensate with uniform few body losses
by I. Bouchoule, M. Schemmer, C. Henkel
Submission summary
| Authors (as registered SciPost users): | Isabelle Bouchoule · Maximilian Schemmer |
| Submission information | |
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| Preprint Link: | https://arxiv.org/abs/1806.08759v4 (pdf) |
| Date accepted: | Oct. 26, 2018 |
| Date submitted: | Oct. 25, 2018, 2 a.m. |
| Submitted by: | Isabelle Bouchoule |
| Submitted to: | SciPost Physics |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Theoretical |
Abstract
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 $j$th 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 $mc^2$, where $m$ is the mass of the particles and $c$ 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.
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List of changes
Published as SciPost Phys. 5, 043 (2018)