Hettler, M. H. and Tahvildar-Zadeh, A. N. and Jarrell, M. and Pruschke, T. and Krishnamurthy, H. R. (1998) Nonlocal dynamical correlations of strongly interacting electron systems. PHYSICAL REVIEW B, 58 (12). R7475-R7479. ISSN 1098-0121, 1550-235X
Full text not available from this repository.Abstract
We introduce an extension of the dynamical mean-field approximation (DMFA) that retains the causal properties and generality of the DMFA, but allows for systematic inclusion of nonlocal corrections. Our technique maps the problem to a self-consistently embedded cluster. The DMFA (exact result) is recovered as the cluster size goes to 1 (infinity). As a demonstration, we study the Falicov-Kimball model using a variety of cluster sizes. We show that the sum rules are preserved, the spectra are positive definite, and the nonlocal correlations suppress the charge-density wave transition temperature. [S0163-1829(98)51436-1].
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | FALICOV-KIMBALL MODEL; MEAN-FIELD THEORY; HUBBARD-MODEL; INFINITE DIMENSIONS; LIMIT |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Feb 2023 07:43 |
| Last Modified: | 16 Feb 2023 07:43 |
| URI: | https://pred.uni-regensburg.de/id/eprint/49498 |
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