Dynamical cluster approximation: Nonlocal dynamics of correlated electron systems
نویسندگان
چکیده
منابع مشابه
Dynamical cluster approximation: Nonlocal dynamics of correlated electron systems
We recently introduced the dynamical cluster approximation ~DCA!, a technique that includes short-ranged dynamical correlations in addition to the local dynamics of the dynamical mean-field approximation while preserving causality. The technique is based on an iterative self-consistency scheme on a finite-size periodic cluster. The dynamical mean-field approximation ~exact result! is obtained b...
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The development of dynamical mean field methods has resulted in significant advances in our understanding of strongly correlated electron systems, in particular in the area of the Mott transition. This method captures the local effects of correlations such as the Kondo effect and the transfer of spectral weight between the coherent and the incoherent part of the spectral function. It suffers, h...
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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-Kimbal...
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The dynamical cluster approximation (DCA) is a method which systematically incorporates nonlocal corrections to the dynamical mean-field approximation. Here we present a pedagogical discussion of the DCA by describing it as a ̊-derivable coarse-graining approximation in k-space, which maps an infinite lattice problem onto a periodic finite-sized cluster embedded in a self-consistently determine...
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S.-X. Yang,1 H. Fotso,1 H. Hafermann,2 K.-M. Tam,1 J. Moreno,1 T. Pruschke,3 and M. Jarrell1 1Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA 2Centre de Physique Théorique, École Polytechnique, CNRS, FR-91128 Palaiseau Cedex, France 3Department of Physics, University of Göttingen, GE-37077 Göttingen, Germany (Received 10 May 2011; revised manus...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 2000
ISSN: 0163-1829,1095-3795
DOI: 10.1103/physrevb.61.12739