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A variational approach to the three-body problem in the Hubbard model. Exact result

✍ Scribed by E.G. Goryachev


Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
281 KB
Volume
166
Category
Article
ISSN
0375-9601

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A simple variational-perturbational appr
✍ L.S. Cederbaum; K. SchoΒ¨nhammer; W. von Niessen πŸ“‚ Article πŸ“… 1975 πŸ› Elsevier Science 🌐 English βš– 231 KB

A simp!e ansat;: for the gound state of atoms and molecules is proposed which is also suitable for large internuclear dis-tanc~ where pertrxbation theory breaks down. In its simplest form, where only doubly+xcited configurations are included, the ansatz leads to 97.3% of the exact correhtion energy