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- W135295917 abstract "The spin-summed density correlation (polarization) function is directly related to the inverse dielectric function (dielectric function) of the electron gas. It obeys a spectral representation with a spectral function that represents the spectral behavior of collective and/or two-particle excitations. It fulfills the oscillator-strength and screening sum rules. Special care has to be taken for the spatial inhomogeneity of the system that gives rise to local-field effects. By means of the spectral functions of the density correlation and polarization functions the validity of the Kramers-Kronig relations can be easily proven for the inverse dielectric function as well as the dielectric function. For the model system of a homogeneous gas of non-interacting electrons the density correlation function is analytically calculated as a wave-vector- and frequency-dependent function. It allows the discussion of electron-hole pair excitations and excitation of plasmons. The latter ones suggest a plasmon pole approximation as a reasonable description of the screening properties. Improvements to include spatial inhomogeneities and image potential effects at surfaces as well as for layered systems are also discussed." @default.
- W135295917 created "2016-06-24" @default.
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- W135295917 date "2014-12-02" @default.
- W135295917 modified "2023-09-25" @default.
- W135295917 title "Density Correlation and Electronic Polarization" @default.
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- W135295917 doi "https://doi.org/10.1007/978-3-662-44593-8_13" @default.
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