Temperature-dependent quantum pair potentials and their application to dense partially ionized hydrogen plasmas

Details Temperature-dependent quantum pair potentials and their application to dense partially ionized hydrogen plasmas Temperature-dependent quantum pair potentials and their application to dense partially ionized hydrogen plasmas

2003-10-28

arxiv.org/abs/cond-mat/0310665v2

Phys. Rev. E 70, 046411 (2004)

Physics

Condensed Matter

Statistical Mechanics

18 pages, 11 figures

Scientific paper

10.1103/PhysRevE.70.046411

Extending our previous work \cite{filinov-etal.jpa03ik} we present a detailed discussion of accuracy and practical applications of finite-temperature pseudopotentials for two-component Coulomb systems. Different pseudopotentials are discussed: i) the diagonal Kelbg potential, ii) the off-diagonal Kelbg potential iii) the {\em improved} diagonal Kelbg potential, iv) an effective potential obtained with the Feynman-Kleinert variational principle v) the ``exact'' quantum pair potential derived from the two-particle density matrix. For the {\em improved} diagonal Kelbg potential a simple temperature dependent fit is derived which accurately reproduces the ``exact'' pair potential in the whole temperature range. The derived pseudopotentials are then used in path integral Monte Carlo (PIMC) and molecular dynamics (MD) simulations to obtain thermodynamical properties of strongly coupled hydrogen. It is demonstrated that classical MD simulations with spin-dependent interaction potentials for the electrons allow for an accurate description of the internal energy of hydrogen in the difficult regime of partial ionization down to the temperatures of about $60 000$ K. Finally, we point out an interesting relation between the quantum potentials and effective potentials used in density functional theory.

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