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Bimodal momentum distribution of laser-cooled atoms in optical lattices
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0003-3096-1972
Stockholm University.
University of Nice.
Umeå University, Faculty of Science and Technology, Department of Physics.
2016 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 93, no 5, 053416Article in journal (Refereed) Published
Abstract [en]

We study, numerically and experimentally, the momentum distribution of atoms cooled in optical lattices. Using semiclassical simulations, we show that this distribution is bimodal, made up of a central feature corresponding to "cold," trapped atoms, with tails of "hot," untrapped atoms, and that this holds true also for very shallow potentials. Careful analysis of the distribution of high-momentum untrapped atoms, both from simulations and experiments, shows that the tails of the distribution do not follow a normal law, hinting at a power-law distribution and nonergodic behavior. We also revisit the phenomenon leading to the existence of an optimal cooling point, i.e., a potential depth below which the temperature of the atoms starts increasing.

Place, publisher, year, edition, pages
2016. Vol. 93, no 5, 053416
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-120710DOI: 10.1103/PhysRevA.93.053416ISI: 000376242200007OAI: oai:DiVA.org:umu-120710DiVA: diva2:929495
Funder
Swedish Research CouncilSwedish National Infrastructure for Computing (SNIC), 001/11-284
Available from: 2016-05-18 Created: 2016-05-18 Last updated: 2017-11-30Bibliographically approved

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CiteExportLink to record
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  • apa
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