Cooling phonon modes of a Bose condensate with uniform few body losses
- 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 jth 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.
Author details: | Isabelle Bouchoule, Max SchemmerORCiD, Carsten HenkelORCiDGND |
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DOI: | https://doi.org/10.21468/SciPostPhys.5.5.043 |
ISSN: | 2542-4653 |
Title of parent work (English): | Scipost Physics |
Publisher: | Scipost foundation |
Place of publishing: | Amsterdam |
Publication type: | Article |
Language: | English |
Date of first publication: | 2018/11/02 |
Publication year: | 2018 |
Release date: | 2021/07/09 |
Volume: | 5 |
Issue: | 5 |
Number of pages: | 18 |
Funding institution: | Studienstiftung des deutschen Volkes; Region Ile de France (DIM NanoK, Atocirc project)Region Ile-de-France; Deutsche ForschungsgemeinschaftGerman Research Foundation (DFG) [Schm 1049/7-1, Fo 703/2-1] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Peer review: | Referiert |
Publishing method: | Open Access / Gold Open-Access |
DOAJ gelistet | |
License (German): | CC-BY - Namensnennung 4.0 International |
External remark: | Zweitveröffentlichung in der Schriftenreihe Postprints der Universität Potsdam :[Mathematisch-Naturwissenschaftliche Reihe]; [1029] |