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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 http://dx.doi.org/10.1103/PhysRevB.69.134502 |
It is part of: | Physical Review B, 2004, vol. 69, núm. 13, p. 134502-1-134502-10 |
URI: | http://hdl.handle.net/2445/10542 |
Related resource: | http://dx.doi.org/10.1103/PhysRevB.69.134502 |
ISSN: | 0163-1829 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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