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- Title
Cluster dual fermion approach to nonlocal correlations.
- Authors
Hafermann, H.; Brener, S.; Rubtsov, A. N.; Katsnelson, M. I.; Lichtenstein, A. I.
- Abstract
A general cluster dual fermion approach to nonlocal correlations in crystals is formulated. The scheme allows the treatment of long-range correlations beyond the cluster dynamical mean field theory and nonlocal effects in realistic calculations of multiorbital systems. The simplest approximation is shown to exactly correspond to the free-cluster dynamical mean field theory. This approach is applied to the one-dimensional Hubbard model. Already the first dual-fermion correction to the free cluster leads to a drastic improvement of the calculated Green’s function.
- Subjects
FERMIONS; PAIRING correlations (Nuclear physics); CRYSTALS; MEAN field theory; HUBBARD model
- Publication
JETP Letters, 2008, Vol 86, Issue 10, p677
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/S0021364007220134