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Orbital-free effective embedding potential at nuclear cusps.

Juan Maria Garcia Lastra1, Jakub W Kaminski, Tomasz A Wesolowski

  • 1Departement de Chimie Physique 30, Universite de Geneve, quai Ernest-Ansermet, CH-1211 Geneve 4, Switzerland.

The Journal of Chemical Physics
|December 3, 2008
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Summary
This summary is machine-generated.

A new strategy improves approximations for the kinetic-energy-dependent potential in embedded electronic structure calculations. This method enhances the local behavior of the effective potential near nuclei, leading to better overall properties.

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Area of Science:

  • Computational Chemistry
  • Quantum Chemistry
  • Materials Science

Background:

  • Accurate calculation of the kinetic-energy-dependent component of the effective potential is crucial for orbital-free density functional theory.
  • Existing approximants for this potential often exhibit poor local behavior near atomic nuclei in embedded environments.
  • The frozen-density embedding method requires reliable effective potentials for accurate electronic structure calculations.

Purpose of the Study:

  • To develop a novel strategy for constructing improved approximants to the kinetic-energy-functional dependent component of the effective potential.
  • To enhance the local behavior of the orbital-free effective embedding potential, particularly near nuclei in the frozen-density environment.
  • To achieve improved accuracy in electronic structure properties by utilizing better approximants for the effective potential.

Main Methods:

  • A new strategy is proposed to construct approximants for v(t)[rho(A),rho(B)](r), the kinetic-energy-functional dependent component of the effective potential.
  • The strategy incorporates the exact asymptotic behavior of v(t)[rho(A),rho(B)](r) as the density of the embedded system approaches zero (rho(A)-->0) and the number of electrons in the environment is fixed (integral rho(B)dr=2).
  • The constructed approximants are nondecomposable, meaning they do not allow for an analytic expression of the total kinetic energy functional.

Main Results:

  • The proposed strategy successfully improves the local behavior of the orbital-free effective embedding potential near nuclei.
  • Properties dependent on the quality of the effective potential show consistent improvement compared to conventional approximants.
  • The simplest approximant derived from this strategy is nondecomposable and offers a practical improvement over existing methods.

Conclusions:

  • The developed strategy provides a robust method for constructing accurate approximants to the kinetic-energy-dependent effective potential.
  • Improved local behavior of the potential leads to enhanced accuracy in electronic structure calculations using embedded methods.
  • The nondecomposable nature of the approximants highlights their specific utility within the context of orbital-free calculations.