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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 mc2, 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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URN: | urn:nbn:de:kobv:517-opus4-468811 |
DOI: | https://doi.org/10.25932/publishup-46881 |
ISSN: | 1866-8372 |
Title of parent work (German): | Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe |
Publication series (Volume number): | Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe (1029) |
Publication type: | Postprint |
Language: | English |
Date of first publication: | 2020/12/10 |
Publication year: | 2018 |
Publishing institution: | Universität Potsdam |
Release date: | 2020/12/10 |
Tag: | 3 body recombination; Bose-Einstein condensates (BECs); gas; harmonic traps; one-dimensional Bose gas; phonon modes; scattering |
Issue: | 1029 |
Number of pages: | 20 |
Source: | SciPost Physics 5 (2018) 043 DOI: 10.21468/SciPostPhys.5.5.043 |
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 / Green Open-Access |
License (German): | CC-BY - Namensnennung 4.0 International |
External remark: | Bibliographieeintrag der Originalveröffentlichung/Quelle |