Nonlocal dynamical correlations of strongly interacting electron systems

Hettler, MH and Tahvildar-Zadeh, AN and Jarrell, M and Pruschke, T and Krishnamurthy, HR (1998) Nonlocal dynamical correlations of strongly interacting electron systems. In: Physical Review B: Condensed Matter and Materials Physics, 58 (12). R7475-R7479.

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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:	Journal Article
Additional Information:	Copyright of this article belongs to American Physical Society.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	18 Dec 2009 07:27
Last Modified:	19 Sep 2010 05:26
URI:	http://eprints.iisc.ernet.in/id/eprint/19003

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