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  1. 1 2009

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  1. 1 Bonačić Lošić Ž.

  2. 1 Županović P.

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Dielectric response of metallic crystal made up of highly polarisable molecules: the semi-classical approach

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Bonačić Lošić Ž., Županović P.
Open Physics
|
2009
|
vol. 7
|
issue 4
721-730
EN
The dielectric response is considered within models of a one-band metal, a two-band insulator and a two-band metal using the semi-classical approximation. Corresponding dielectric functions are found. The dielectric function of two-band metal is found to be the interpolation between the Sellmeyer and Lorenz-Lorentz expressions, respectively. The frequencies of the collective modes are identified as the zeroes of the dielectric functions. The correspondence between the semi-classical approach used in this paper and the many-body calculation within the random-phase approximation is established.
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