期刊
INTERNATIONAL JOURNAL OF MODERN PHYSICS E
卷 17, 期 1, 页码 138-150出版社
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S021830130800963X
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We first give a short review of the local-current approximation (LCA), derived from a general variation principle, which serves as a semiclassical description of strongly collective excitations in finite fermion systems starting from their quantum-mechanical mean-field ground state. We illustrate it for the example of coupled translational and compressional dipole excitations in metal clusters. We then discuss collective electronic dipole excitations in C-60 molecules (Buckminster fullerenes). We show that the coupling of the pure translational mode (surface plasmon) with compressional volume modes in the semiclasscial LCA yields semi-quantitative agreement with microscopic time-dependent density functional (TDLDA) calculations, while both theories yield qualitative agreement with the recent experimental observation of a volume plasmon.
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