Hettler, M. H. ; Tahvildar-Zadeh, A. N. ; Jarrell, M. ; Pruschke, T. ; Krishnamurthy, H. R. (1998) Nonlocal dynamical correlations of strongly interacting electron systems Physical Review B, 58 (12). R7475-R7479. ISSN 0163-1829
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Official URL: http://link.aps.org/doi/10.1103/PhysRevB.58.R7475
Related URL: http://dx.doi.org/10.1103/PhysRevB.58.R7475
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.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Physical Society. |
ID Code: | 17496 |
Deposited On: | 16 Nov 2010 09:42 |
Last Modified: | 17 May 2016 02:07 |
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