Mostra el registre d'ítem simple
Possible superfluidity of molecular hydrogen in a two-dimensional crystal phase of sodium
dc.contributor.author | Cazorla Silva, Claudio |
dc.contributor.author | Boronat Medico, Jordi |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear |
dc.date.accessioned | 2014-02-10T16:17:42Z |
dc.date.available | 2014-02-10T16:17:42Z |
dc.date.created | 2013-12-03 |
dc.date.issued | 2013-12-03 |
dc.identifier.citation | Cazorla, C.; Boronat, J. Possible superfluidity of molecular hydrogen in a two-dimensional crystal phase of sodium. "Physical review B: condensed matter and materials physics", 03 Desembre 2013, vol. 88, núm. 22, p. 224501-1-224501-6. |
dc.identifier.issn | 1098-0121 |
dc.identifier.uri | http://hdl.handle.net/2117/21500 |
dc.description.abstract | We theoretically investigate the ground-state properties of a molecular para-hydrogen (p-H 2 ) film in which crystallization is energetically frustrated by embedding sodium (Na) atoms periodically distributed in a triangular lattice. In order to fully deal with the quantum nature of p-H 2 molecules, we employ the diffusion Monte Carlo method and realistic semiempirical pairwise potentials describing the interactions between H 2 -H 2 and Na-H 2 species. In particular, we calculate the energetic, structural, and superfluid properties of two-dimensional Na-H 2 systems within a narrow density interval around equilibrium at zero temperature. In contrast to previous computational studies considering other alkali metal species such as rubidium and potassium, we find that the p-H 2 ground state is a liquid with a significantly large superfluid fraction of ρ s /ρ=0.29(2) . The appearance of p-H 2 superfluid response is due to the fact that the interactions between Na atoms and H 2 molecules are less attractive than between H 2 molecules. This induces a considerable reduction of the hydrogen density which favors the stabilization of the liquid phase. |
dc.language.iso | eng |
dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Spain |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
dc.subject | Àrees temàtiques de la UPC::Física |
dc.subject.lcsh | Hydrogen |
dc.subject.lcsh | Sodium |
dc.subject.lcsh | Superfluidity |
dc.subject.lcsh | Monte Carlo method |
dc.subject.other | Molecular hydrogen |
dc.subject.other | two-dimensional |
dc.subject.other | crystal phase of sodium |
dc.title | Possible superfluidity of molecular hydrogen in a two-dimensional crystal phase of sodium |
dc.type | Article |
dc.subject.lemac | Hidrogen |
dc.subject.lemac | Sodi |
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.88.224501 |
dc.relation.publisherversion | http://prb.aps.org/abstract/PRB/v88/i22/e224501 |
dc.rights.access | Open Access |
local.identifier.drac | 13021493 |
dc.description.version | Postprint (published version) |
local.citation.author | Cazorla, C.; Boronat, J. |
local.citation.publicationName | Physical review B: condensed matter and materials physics |
local.citation.volume | 88 |
local.citation.number | 22 |
local.citation.startingPage | 224501-1 |
local.citation.endingPage | 224501-6 |