Bimodal momentum distribution of laser-cooled atoms in optical lattices
Number of Authors: 4
2016 (English)In: Physical Review A, ISSN 2469-9926, Vol. 93, no 5, 053416Article in journal (Refereed) Published
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
IdentifiersURN: urn:nbn:se:su:diva-131523DOI: 10.1103/PhysRevA.93.053416ISI: 000376242200007OAI: oai:DiVA.org:su-131523DiVA: diva2:945903