Anisotropic long-range interaction investigated with cold atoms
In two dimensions, a system of self-gravitating particles collapses and forms a singularity in finite time below a critical temperature Tc. We investigate experimentally a quasi-two-dimensional cloud of cold neutral atoms in interaction with two pairs of perpendicular counterpropagating quasiresonan...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2021
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| Online Access: | https://hdl.handle.net/10356/145771 |
| _version_ | 1811679684526604288 |
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| author | Mancois, Vincent Barré, Julien Kwong, Chang Chi Olivetti, Alain Viot, Pascal Wilkowski, David |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Mancois, Vincent Barré, Julien Kwong, Chang Chi Olivetti, Alain Viot, Pascal Wilkowski, David |
| author_sort | Mancois, Vincent |
| collection | NTU |
| description | In two dimensions, a system of self-gravitating particles collapses and forms a singularity in finite time below a critical temperature Tc. We investigate experimentally a quasi-two-dimensional cloud of cold neutral atoms in interaction with two pairs of perpendicular counterpropagating quasiresonant laser beams, in order to look for a signature of this ideal phase transition: indeed, the radiation pressure forces exerted by the laser beams can be viewed as an anisotropic, and nonpotential, generalization of two-dimensional self-gravity. We first show that our experiment operates in a parameter range which should be suitable to observe the collapse transition. However, the experiment unveils only a moderate compression instead of a phase transition between the two phases. A three-dimensional numerical simulation shows that both the finite small thickness of the cloud, which induces a competition between the effective gravity force and the repulsive force due to multiple scattering, and the atomic losses due to heating in the third dimension contribute to smearing the transition. |
| first_indexed | 2024-10-01T03:13:04Z |
| format | Journal Article |
| id | ntu-10356/145771 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:13:04Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1457712023-02-28T19:56:40Z Anisotropic long-range interaction investigated with cold atoms Mancois, Vincent Barré, Julien Kwong, Chang Chi Olivetti, Alain Viot, Pascal Wilkowski, David School of Physical and Mathematical Sciences MajuLab@NTU Science::Physics Long-range Interaction Anisotropy In two dimensions, a system of self-gravitating particles collapses and forms a singularity in finite time below a critical temperature Tc. We investigate experimentally a quasi-two-dimensional cloud of cold neutral atoms in interaction with two pairs of perpendicular counterpropagating quasiresonant laser beams, in order to look for a signature of this ideal phase transition: indeed, the radiation pressure forces exerted by the laser beams can be viewed as an anisotropic, and nonpotential, generalization of two-dimensional self-gravity. We first show that our experiment operates in a parameter range which should be suitable to observe the collapse transition. However, the experiment unveils only a moderate compression instead of a phase transition between the two phases. A three-dimensional numerical simulation shows that both the finite small thickness of the cloud, which induces a competition between the effective gravity force and the repulsive force due to multiple scattering, and the atomic losses due to heating in the third dimension contribute to smearing the transition. Published version 2021-01-07T06:48:47Z 2021-01-07T06:48:47Z 2020 Journal Article Mancois, V., Barré, J., Kwong, C. C., Olivetti, A., Viot, P., & Wilkowski, D. (2020). Anisotropic long-range interaction investigated with cold atoms. Physical Review A, 102(1), 013311-. doi:10.1103/physreva.102.013311 2469-9926 https://hdl.handle.net/10356/145771 10.1103/PhysRevA.102.013311 1 102 en Physical Review A © 2020 American Physical Society (APS). All rights reserved. This paper was published in Physical Review A and is made available with permission of American Physical Society (APS). application/pdf |
| spellingShingle | Science::Physics Long-range Interaction Anisotropy Mancois, Vincent Barré, Julien Kwong, Chang Chi Olivetti, Alain Viot, Pascal Wilkowski, David Anisotropic long-range interaction investigated with cold atoms |
| title | Anisotropic long-range interaction investigated with cold atoms |
| title_full | Anisotropic long-range interaction investigated with cold atoms |
| title_fullStr | Anisotropic long-range interaction investigated with cold atoms |
| title_full_unstemmed | Anisotropic long-range interaction investigated with cold atoms |
| title_short | Anisotropic long-range interaction investigated with cold atoms |
| title_sort | anisotropic long range interaction investigated with cold atoms |
| topic | Science::Physics Long-range Interaction Anisotropy |
| url | https://hdl.handle.net/10356/145771 |
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