Optical properties and one-particle spectral function in non-ideal plasmas

Details Optical properties and one-particle spectral function in non-ideal plasmas Optical properties and one-particle spectral function in non-ideal plasmas

2006-10-28

arxiv.org/abs/physics/0610262v1

Physics

Plasma Physics

13 pages, 7 figures, 52 references. Submitted to Contrib. Plasma Phys. Results presented at the International Workshop on Phys

Scientific paper

10.1002/ctpp.200710040

A basic concept to calculate physical features of non-ideal plasmas, such as optical properties, is the spectral function which is linked to the self-energy. We calculate the spectral function for a non-relativistic hydrogen plasma in $GW$-approximation. In order to go beyond $GW$ approximation, we include self-energy and vertex correction to the polarization function in lowest order. Partial compensation is observed. The relation of our approach to $GW$ and $GW\Gamma$ calculations in other fields, such as the band-structure calculations in semiconductor physics, is discussed. From the spectral function we derive the absorption coefficient due to inverse bremsstrahlung via the polarization function. As a result, a significant reduction of the absorption as compared to the Bethe-Heitler formula for bremsstrahlung is obtained.

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