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Bimodal momentum distribution of laser-cooled atoms in optical lattices
Stockholm University, Faculty of Science, Department of Physics.
Number of Authors: 4
2016 (English)In: Physical Review A, ISSN 2469-9926, 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
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-131523DOI: 10.1103/PhysRevA.93.053416ISI: 000376242200007OAI: oai:DiVA.org:su-131523DiVA: diva2:945903
Available from: 2016-07-04 Created: 2016-06-21 Last updated: 2016-07-04Bibliographically approved

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