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Dynamic structure factor of liquid He 4 across the normal-superfluid transition
dc.contributor.author | Ferré Porta, Guillem |
dc.contributor.author | Boronat Medico, Jordi |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament de Física |
dc.date.accessioned | 2016-05-31T15:02:22Z |
dc.date.available | 2016-05-31T15:02:22Z |
dc.date.issued | 2016-03-08 |
dc.identifier.citation | Ferré, 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.identifier.issn | 1550-235X |
dc.identifier.uri | http://hdl.handle.net/2117/87562 |
dc.description.abstract | We 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.language.iso | eng |
dc.subject | Àrees temàtiques de la UPC::Física |
dc.subject | Àrees temàtiques de la UPC::Física::Mecànica quàntica |
dc.subject.lcsh | Quantum theory |
dc.subject.lcsh | Liquid helium |
dc.subject.lcsh | Monte Carlo method |
dc.title | Dynamic structure factor of liquid He 4 across the normal-superfluid transition |
dc.type | Article |
dc.subject.lemac | Quàntums, Teoria dels |
dc.subject.lemac | Heli líquid |
dc.subject.lemac | Montecarlo, Mètode de |
dc.contributor.group | Universitat Politècnica de Catalunya. SIMCON - First-principles approaches to condensed matter physics: quantum effects and complexity |
dc.identifier.doi | 10.1103/PhysRevB.93.104510 |
dc.description.peerreviewed | Peer Reviewed |
dc.rights.access | Open Access |
local.identifier.drac | 18186458 |
dc.description.version | Postprint (author's final draft) |
dc.relation.projectid | info:eu-repo/grantAgreement/MINECO//FIS2014-56257-C2-1-P/ES/MATERIA CUÁNTICA ULTRAFRIA/ |
local.citation.author | Ferré, G.; Boronat, J. |
local.citation.publicationName | Physical Review B - Condensed Matter and Materials Physics |
local.citation.volume | 93 |
local.citation.number | 104510 |
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