Bochum 2015 – scientific programme

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P: Fachverband Plasmaphysik

P 14: Poster Session - Theory and Modelling

P 14.13: Poster

Tuesday, March 3, 2015, 16:30–18:30, Foyer Audimax

The ion potential in warm dense matter: wake effects due to streaming degenerate electrons — Zhandos Moldabekov¹, •Patrick Ludwig², Michael Bonitz¹, and Tlekkabul Ramazano² — ¹Al-Farabi Kazakh National University, Almaty, Kazakhstan — ²Universität Kiel

The effective dynamically screened potential of a classical ion in a stationary flowing quantum plasma at finite temperature is investigated. This potential has been studied before within hydrodynamic approaches or based on the zero temperature Lindhard dielectric function. Here we extend the kinetic analysis by including the effects of finite temperature and of collisions based on the Mermin dielectric function. The resulting ion potential exhibits an oscillatory structure with attractive wake minima and, thus, strongly deviates from the static Yukawa potential of equilibrium plasmas. This potential is analyzed in detail for high-density plasmas for a broad range of plasma temperature and electron streaming velocity. It is shown that wake effects become weaker with increasing temperature of the electrons. Finally, we obtain the minimal electron streaming velocity for which attraction between ions occurs. This velocity turns out to be less than the electron Fermi velocity. Our results allow for reliable predictions of wake effects in nonequilibrium quantum plasmas with fast streaming electrons showing that these effects are crucial for transport under warm dense matter conditions, in particular for laser-matter interaction, electron-ion temperature equilibration and for stopping power. [1] arXiv:1409.8079 [physics.plasm-ph]