Abstract
In Chap. 4 we discussed various methods used by quantum chemists to describe electron correlations in molecules. These methods, though, cannot be carried over to infinite systems, i.e., solids, a fact immediately obvious for methods that use canonical MOs. Since the canonical MOs extend over the whole molecule, one would have to deal with an increasing number of them as the system increases in size. This limitation also holds true for finite or infinite periodic lattices. Physically, one would expect, however, the description of the (local) correlation hole of an electron to be no more difficult in a solid than in a molecule.
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Chapter 5
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© 1991 Springer-Verlag in Berlin Heidelberg
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Fulde, P. (1991). The Projection Technique and Use of Local Operators. In: Electron Correlations in Molecules and Solids. Springer Series in Solid-State Sciences, vol 100. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-97309-3_5
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DOI: https://doi.org/10.1007/978-3-642-97309-3_5
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