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dc.contributor.authorAstrakharchik, Grigori
dc.contributor.authorBoronat Medico, Jordi
dc.contributor.authorKrotscheck, Eckhard
dc.contributor.authorLichtenegger, Thomas
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear
dc.date.accessioned2015-02-26T08:58:44Z
dc.date.available2015-02-26T08:58:44Z
dc.date.created2014-08-14
dc.date.issued2014-08-14
dc.identifier.citationAstrakharchik, G. [et al.]. Dynamic structure function of a cold Fermi gas at unitarity. "Journal of physics: conference series", 14 Agost 2014, vol. 529, núm. 1.
dc.identifier.issn1742-6588
dc.identifier.urihttp://hdl.handle.net/2117/26519
dc.description.abstractWe present a theoretical study of the dynamic structure function of a resonantly interacting two-component Fermi gas at zero temperature. Our approach is based on dynamic many-body theory able to describe excitations in strongly correlated Fermi systems. The fixed-node diffusion Monte Carlo method is used to produce the ground-state correlation functions which are used as an input for the excitation theory. Our approach reproduces recent Bragg scattering data in both the density and the spin channel. In the BCS regime, the response is close to that of the ideal Fermi gas. On the BEC side, the Bose peak associated with the formation of dimers dominates the density channel of the dynamic response. When the fraction of dimers is large our theory departs from the experimental data, mainly in the spin channel.
dc.language.isoeng
dc.publisherInstitute of Physics (IOP)
dc.rightsAttribution 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Energies::Recursos energètics no renovables::Gas
dc.subject.lcshElectron gas
dc.subject.lcshMonte Carlo method
dc.subject.otherDynamic response
dc.subject.otherElectron gas
dc.subject.otherMonte Carlo methods
dc.subject.otherDiffusion Monte Carlo method
dc.subject.otherDynamic structure
dc.subject.otherExcitation theory
dc.subject.otherGround-state correlation
dc.subject.otherMany-body theory
dc.subject.otherTheoretical study
dc.subject.otherTwo-component fermi gas
dc.subject.otherZero temperatures
dc.subject.otherFermions
dc.titleDynamic structure function of a cold Fermi gas at unitarity
dc.typeArticle
dc.subject.lemacGas
dc.subject.lemacMontecarlo, Mètode de
dc.contributor.groupUniversitat Politècnica de Catalunya. SIMCON - Grup de Recerca de Simulació per Ordinador en Matèria Condensada
dc.identifier.doi10.1088/1742-6596/529/1/012009
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttp://iopscience.iop.org/1742-6596/529/1/012009/pdf/1742-6596_529_1_012009.pdf
dc.rights.accessOpen Access
drac.iddocument15249896
dc.description.versionPostprint (published version)
upcommons.citation.authorAstrakharchik, G.; Boronat, J.; Krotscheck, E.; Lichtenegger, T.
upcommons.citation.publishedtrue
upcommons.citation.publicationNameJournal of physics: conference series
upcommons.citation.volume529
upcommons.citation.number1


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Except where otherwise noted, content on this work is licensed under a Creative Commons license: Attribution 3.0 Spain