Temperature dependence of the density and excitations of dipolar droplets

buir.contributor.authorEnes, Aybar
buir.contributor.authorOktel, M. Özgür
dc.citation.epage033329-1en_US
dc.citation.issueNumber3en_US
dc.citation.spage033329-10en_US
dc.citation.volumeNumber102en_US
dc.contributor.authorÖztürk, S. F.
dc.contributor.authorEnes, Aybar
dc.contributor.authorOktel, M. Özgür
dc.date.accessioned2021-03-02T08:39:31Z
dc.date.available2021-03-02T08:39:31Z
dc.date.issued2020
dc.departmentDepartment of Physicsen_US
dc.description.abstractDroplet states of ultracold gases which are stabilized by fluctuations have recently been observed in dipolar and two-component Bose gases. These systems present an alternate form of equilibrium where an instability at the mean-field level is arrested by higher-order correlations, making the droplet states sensitive probes of fluctuations. In a recent paper, we argued that thermal fluctuations can play an important role for droplets even at low temperatures where the noncondensed density is much smaller than the condensate density. We used the Hartree-Fock-Bogoliubov theory together with the local density approximation for fluctuations to obtain a generalized Gross-Pitaevskii (GP) equation and solved it with a Gaussian variational ansatz to show that the transition between the low density and droplet states can be significantly modified by the temperature. In this paper, we first solve the same GP equation numerically with a time-splitting spectral method to check the validity of the Gaussian variational ansatz. Our numerical results are in good agreement with the Gaussian ansatz for a large parameter regime and show that the density of the gas is most strongly modified by temperature near the abrupt transition between a pancake-shaped cloud and the droplet. For cigar-shaped condensates, as in the recent Er experiments, the dependence of the density on temperature remains quite small throughout the smooth transition. We then consider the effect of temperature on the collective oscillation frequencies of the droplet using both a time-dependent Gaussian variational ansatz and real-time numerical evolution. We find that the oscillation frequencies depend significantly on the temperature close to the transition for the experimentally relevant temperature regime (≃100nK).en_US
dc.description.provenanceSubmitted by Zeynep Aykut (zeynepay@bilkent.edu.tr) on 2021-03-02T08:39:31Z No. of bitstreams: 1 Temperature_dependence_of_the_density_and_excitations_of_dipolar_droplets.pdf: 815127 bytes, checksum: b7d2ee8c29405204de2a64a09c6f26d2 (MD5)en
dc.description.provenanceMade available in DSpace on 2021-03-02T08:39:31Z (GMT). No. of bitstreams: 1 Temperature_dependence_of_the_density_and_excitations_of_dipolar_droplets.pdf: 815127 bytes, checksum: b7d2ee8c29405204de2a64a09c6f26d2 (MD5) Previous issue date: 2020en
dc.identifier.doi10.1103/PhysRevA.102.033329en_US
dc.identifier.issn2469-9926
dc.identifier.urihttp://hdl.handle.net/11693/75693
dc.language.isoEnglishen_US
dc.publisherAmerican Physical Societyen_US
dc.relation.isversionofhttps://dx.doi.org/10.1103/PhysRevA.102.033329en_US
dc.source.titlePhysical Review Aen_US
dc.subjectDipolar gasesen_US
dc.subjectBose gasesen_US
dc.subjectHartree-Fock-Bogoliubov theoryen_US
dc.titleTemperature dependence of the density and excitations of dipolar dropletsen_US
dc.typeArticleen_US

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