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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.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.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.publisherInstitute of Physics (IOP)
dc.rightsAttribution 3.0 Spain
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.titleDynamic structure function of a cold Fermi gas at unitarity
dc.subject.lemacMontecarlo, Mètode de
dc.contributor.groupUniversitat Politècnica de Catalunya. SIMCON - Grup de Recerca de Simulació per Ordinador en Matèria Condensada
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (published version)
upcommons.citation.authorAstrakharchik, G.; Boronat, J.; Krotscheck, E.; Lichtenegger, T.
upcommons.citation.publicationNameJournal of physics: conference series

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