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Title: Anisotropic long-range interaction investigated with cold atoms
Authors: Mancois, Vincent
Barré, Julien
Kwong, Chang Chi
Olivetti, Alain
Viot, Pascal
Wilkowski, David
Keywords: Science::Physics
Issue Date: 2020
Source: 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
Journal: Physical Review A
Abstract: 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.
ISSN: 2469-9926
DOI: 10.1103/PhysRevA.102.013311
Rights: © 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).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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