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dc.contributor.authorBarranco Gómez, Manuelcat
dc.contributor.authorHernández, E. Susanacat
dc.contributor.authorMayol Sánchez, Ricardocat
dc.contributor.authorPi Pericay, Martícat
dc.description.abstractWe compute the density-fluctuation spectrum of spherical 4HeN shells adsorbed on the outer surface of Cn fullerenes. The excitation spectrum is obtained within the random-phase approximation, with particle-hole elementary excitations and effective interaction extracted from a density-functional description of the shell structure. The presence of one or two solid helium layers adjacent to the adsorbing fullerene is phenomenologically accounted for. We illustrate our results for a selection of numbers of adsorbed atoms on C20, C60, and C120. The hydrodynamical model that has proven successful to describe helium excitations in the bulk and in restricted geometries permits to perform a rather exhaustive analysis of various fluid spherical systems, namely, spheres, cavities, free bubbles, and bound shells of variable size.eng
dc.publisherThe American Physical Societyeng
dc.relation.isformatofReproducció digital del document publicat en format paper, proporcionada per PROLA i
dc.relation.ispartofPhysical Review B, 2004, vol. 69, núm. 13, p. 134502-1-134502-10eng
dc.rights(c) The American Physical Society, 2004eng
dc.sourceArticles publicats en revistes (Física Quàntica i Astrofísica)-
dc.subject.classificationTeoria del funcional de densitatcat
dc.subject.classificationHeli sòlidcat
dc.subject.classificationEstadística quànticacat
dc.subject.otherSolid heliumeng
dc.subject.otherQuantum statisticseng
dc.subject.otherDensity functional theoryeng
dc.titleDensity modes in spherical 4He shellseng
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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