THEORY OF OPTICAL ABSORPTION IN A SMALL SPHERICAL SHELL: INVESTIGATION OF QUANTUM-SIZE EFFECT

Mikio Eto and Kiyoshi Kawamura
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Mikio Eto: Department of Physics, Faculty of Science and Technology, Keio University, 3–14–1 Hiyoshi, Kohoku-ku, Yokohama 223, Japan
Kiyoshi Kawamura: Department of Physics, Faculty of Science and Technology, Keio University, 3–14–1 Hiyoshi, Kohoku-ku, Yokohama 223, Japan

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 151-155

Abstract: To investigate the quantum-size effect on optical absorption spectra in a small metallic particle of a spherical shell shape, first-principles calculations are performed based on the Kubo formula. The resonant frequency of collective modes and their linewidth are studied systematically with Hartree-Fock and random-phase approximations, which are self-interaction-free methods. System-size dependence of the resonant frequency of the modes is in good agreement with the classical theory, while the linewidth reflects the quantum-size effect, which cannot be explained classically. The origin of the line broadening should be attributed to the Landau damping.

Date: 1996
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DOI: 10.1142/S0218625X96000309

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