Cloud shape of a molecular Bose–Einstein condensate in a disordered trap: A case study of the dirty boson problem

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dc.citation.issue3
dc.citation.rankM21
dc.citation.spage033021
dc.citation.volume22
dc.contributor.authorNagler, Benjamin
dc.contributor.authorRadonjić, Milan
dc.contributor.authorBarbosa, Sian
dc.contributor.authorKoch, Jennifer
dc.contributor.authorPelster, Axel
dc.contributor.authorWidera, Artur
dc.date.accessioned2024-06-18T10:45:34Z
dc.date.available2024-06-18T10:45:34Z
dc.date.issued2020-03-19
dc.description.abstractWe investigate, both experimentally and theoretically, the static geometric properties of a harmonically trapped Bose-Einstein condensate of 6Li2 molecules in laser speckle potentials. Experimentally, we measure the in situ column density profiles and the corresponding transverse cloud widths over many laser speckle realizations. We compare the measured widths with a theory that is non-perturbative with respect to the disorder and includes quantum fluctuations. Importantly, for small disorder strengths we find quantitative agreement with the perturbative approach of Huang and Meng, which is based on Bogoliubov theory. For strong disorder our theory perfectly reproduces the geometric mean of the measured transverse widths. However, we also observe a systematic deviation of the individual measured widths from the theoretically predicted ones. In fact, the measured cloud aspect ratio monotonously decreases with increasing disorder strength, while the theory yields a constant ratio. We attribute this discrepancy to the utilized local density approximation, whose possible failure for strong disorder suggests a potential future improvement.
dc.identifier.doi10.1088/1367-2630/ab73cb
dc.identifier.issn1367-2630
dc.identifier.scopus2-s2.0-85083316168
dc.identifier.urihttps://pub.ipb.ac.rs/handle/123456789/118
dc.identifier.wos000522130400001
dc.language.isoen
dc.publisherInstitute of Physics Publishing
dc.relation.ispartofNew Journal of Physics
dc.relation.ispartofabbrNew J. Phys.
dc.rightsopenAccess
dc.titleCloud shape of a molecular Bose–Einstein condensate in a disordered trap: A case study of the dirty boson problem
dc.typeArticle
dc.type.versionpublishedVersion
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