Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2008-03-18
Phys. Rev. A 77 (2008) 042504
Physics
Condensed Matter
Other Condensed Matter
To appear in Phys. Rev. A
Scientific paper
10.1103/PhysRevA.77.042504
In both molecular physics and condensed matter theory, deeper understanding of the correlation energy density epsilon_c (r) remains a high priority. By adopting Loewdin's definition of correlation energy as the difference between the exact and the Hartree-Fock values, here we propose two alternative routes to define this. One of these involves both exact and Hartree-Fock (HF) wavefunctions, while the second requires a coupling constant integration. As an exact analytical example of the first route, we treat the two-electron model atom of Moshinsky, for which both confinement potential and interactions are harmonic. Though the correlation energy density epsilon_c (r) is known analytically, we also investigate numerically its relation to the exact ground-state density in this example.
Angilella Giuseppe G. N.
Cabo Alejandro
Claro Francisco
March Norman H.
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