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dc.contributor.authorFerré Porta, Guillem
dc.contributor.authorBoronat Medico, Jordi
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.identifier.citationFerré, G., Boronat, J. Dynamic structure factor of liquid He 4 across the normal-superfluid transition. "Physical Review B - Condensed Matter and Materials Physics", 08 Març 2016, vol. 93, núm. 104510.
dc.description.abstractWe have carried out a microscopic study of the dynamic structure factor of liquid He4 across the normal-superfluid transition temperature using the path integral Monte Carlo method. The ill-posed problem of the inverse Laplace transform, from the imaginary-time intermediate scattering function to the dynamic response, is tackled by stochastic optimization. Our results show a quasiparticle peak and a small and broad multiphonon contribution. In spite of the lack of strength in the collective peaks, we clearly identify the rapid dropping of the roton peak amplitude when crossing the transition temperature T¿. Other properties such as the static structure factor, static response, and one-phonon contribution to the response are also calculated at different temperatures. The changes of the phonon-roton spectrum with the temperature are also studied. An overall agreement with available experimental data is achieved.
dc.subjectÀrees temàtiques de la UPC::Física
dc.subjectÀrees temàtiques de la UPC::Física::Mecànica quàntica
dc.subject.lcshQuantum theory
dc.subject.lcshLiquid helium
dc.subject.lcshMonte Carlo method
dc.titleDynamic structure factor of liquid He 4 across the normal-superfluid transition
dc.subject.lemacQuàntums, Teoria dels
dc.subject.lemacHeli líquid
dc.subject.lemacMontecarlo, Mètode de
dc.contributor.groupUniversitat Politècnica de Catalunya. SIMCON - First-principles approaches to condensed matter physics: quantum effects and complexity
dc.description.peerreviewedPeer Reviewed
dc.rights.accessOpen Access
dc.description.versionPostprint (author's final draft)
upcommons.citation.authorFerré, G.; Boronat, J.
upcommons.citation.publicationNamePhysical Review B - Condensed Matter and Materials Physics

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