2007/07/26 by H. Hafermann, S. Brener, A. N. Rubtsov +2 · 37 citations
Physics and Astronomy · #Cluster (spacecraft) #Dual (grammatical number) #Dynamical mean field theory #Fermion #Field (mathematics) #Hubbard model #Mean field theory #Physics of Superconductivity and Magnetism #Quantum Chromodynamics and Particle Interactions #Rare-earth and actinide compounds #cond-mat.str-el
paper · pdf · doi:10.1134/s0021364007220134
published in Journal of Experimental and Theoretical Physics Letters 86(10), 677-682 (Pleiades Publishing)
arxiv created 2007/07/26 · openalex publication_date 2008/01/01 · arxiv updated 2015/05/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.