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Communication: Simple and accurate uniform electron gas correlation energy for the full range of densities
1The Institute for Fundamental Study "The Tah Poe Academia Institute," Naresuan University, Phitsanulok 65000, Thailand.
Abstract:
A simple correlation energy functional for the uniform electron gas is derived based on the second-order Moller-Plesset perturbation theory. It can reproduce the known correlation functional in the high-density limit, while in the mid-density range maintaining a good agreement with the near-exact correlation energy of the uniform electron gas to within 2 × 10(-3) hartree. The correlation energy is a function of a density parameter rs and is of the form a*ln(1+brs+brs (2)). The constants "a" and "b" are derived from the known correlation functional in the high-density limit. Comparisons to the Ceperley-Alder's near-exact Quantum Monte Carlo results and the Vosko-Wilk-Nusair correlation functional are also reported.
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