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Title: Density modes in spherical 4He shells
Author: Barranco Gómez, Manuel
Hernández, E. Susana
Mayol Sánchez, Ricardo
Pi Pericay, Martí
Keywords: Teoria del funcional de densitat
Heli sòlid
Estadística quàntica
Solid helium
Quantum statistics
Density functional theory
Issue Date: 2004
Publisher: The American Physical Society
Abstract: We 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.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review B, 2004, vol. 69, núm. 13, p. 134502-1-134502-10
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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