Abstract
In recent years, a considerable number of approximation schemes has been suggested for the treatment of lattice models of strongly interacting electron systems. The problem is always the following: how to incorporate strong local correlations into a many-electron state which is, on the whole, itinerant. Working out reasonable approximations within the framework of conventional many-body theory is apparently quite difficult but bears the promise of an eventual full description of the dynamics of the system. However, also the static properties have yet to be calculated reliably, e.g., even the ground state phase diagram of the two-dimensional Hubbard model is an open problem.
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Fazekas, P. (1991). Cluster Gutzwiller Approximation. In: Fantoni, S., Rosati, S. (eds) Condensed Matter Theories. Condensed Matter Theories, vol 6. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3686-4_23
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DOI: https://doi.org/10.1007/978-1-4615-3686-4_23
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