Abstract
We present a self-consistent treatment of Hubbard-like lattice models at large, but finite, spatial dimensions . This involves a systematic expansion in powers of about the limit . The first-order corrections can be obtained by self-consistent solution of coupled one- and two-impurity models. We calculate the leading corrections to properties of the Falicov-Kimball model. The infinite-dimensional limit seems to describe this particular model remarkably well even for .
- Received 6 March 1995
DOI:https://doi.org/10.1103/PhysRevLett.75.113
©1995 American Physical Society