Coupling of Surface and Volume Dipole Oscillations in C-60 Molecules

Details Coupling of Surface and Volume Dipole Oscillations in C-60 Molecules Coupling of Surface and Volume Dipole Oscillations in C-60 Molecules

2007-10-15

arxiv.org/abs/0710.2749v1

Int.J.Mod.Phys.E17:138-150,2008

Physics

Atomic and Molecular Clusters

LaTeX, 12 pages, 5 figures (8 *.eps files); Contribution to XIV-th Nuclear Physics Workshop at Kazimierz Dolny, Poland, Sept.

Scientific paper

10.1142/S021830130800963X

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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