New exchange-correlation density functionals: The role of the kinetic-energy density
β Scribed by Boese, A. Daniel; Handy, Nicholas C.
- Book ID
- 120167997
- Publisher
- American Institute of Physics
- Year
- 2002
- Tongue
- English
- Weight
- 720 KB
- Volume
- 116
- Category
- Article
- ISSN
- 0021-9606
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
Since in density functional theory the classical form of the virial theorem does not hold due to the localization effect of exchange-correlation, it is important to investigate the kinetic contribution to correlation. Nearly exact tc([n]; r) kinetic contributions to the correlation energy densities
Further evidence is shown that a kinetic energy functional can be used as an exchange energy functional and, conversely, exchange used as a kinetic energy functional, with a proper transformation of energy as a functional of the density. We have used functionals with two adjustable parameters to det
The kinetic and the exchange energy functionals are expressed in the form T [ p ] = CTFj drp5/3(r)f.,(s) and K [ p ] = C,/drp4/3(r)fK(s), where C,, = (3/10)(3.rr2)2/3 and C , = -(3/4)(3/7~)'/~ are the Thomas-Fermi and the Dirac coefficients, respectively, and s = lVp(r)l/C, p4l3(r), with C, = 2 ( 3