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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2014, Volume 100, Issue 3, Pages 218–225
DOI: https://doi.org/10.7868/S0370274X14150119 (Mi jetpl3800) 		 
This article is cited in 4 scientific papers (total in 4 papers)

METHODS OF THEORETICAL PHYSICS

On the density of states for the Hubbard model: pseudo-particle Keldysh diagram method – an alternative to DMFT?

P. I. Arseeva, N. S. Maslovab

a P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow
b M. V. Lomonosov Moscow State University, Faculty of Physics
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DOI: https://doi.org/10.7868/S0370274X14150119
Abstract: It is shown how to construct Keldysh diagram technique for pseudo-particle approach to the Hubbard model. We propose self consistent equations for pseudo particle and electron Green functions in Keldysh diagram technique. Nonlocal effects (spatial dispersion) are included in single impurity problem in this method. Thus we can get rid of the artificial central peak (of Kondo type) in the density of states which is inevitable in Dynamical Mean Field Theory (DMFT). The changes in the density of states for 2D Hubbard model due to variation of Coulomb repulsion $U$ and electron concentration are analyzed.
Received: 01.07.2014
English version:
Journal of Experimental and Theoretical Physics Letters, 2014, Volume 100, Issue 3, Pages 197–204
DOI: https://doi.org/10.1134/S002136401415003X
Bibliographic databases:
Document Type: Article
Language: English
Citation: P. I. Arseev, N. S. Maslova, “On the density of states for the Hubbard model: pseudo-particle Keldysh diagram method – an alternative to DMFT?”, Pis'ma v Zh. Èksper. Teoret. Fiz., 100:3 (2014), 218–225; JETP Letters, 100:3 (2014), 197–204
Citation in format AMSBIB
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    • This publication is cited in the following 4 articles:
    Citing articles in Google Scholar: Russian citations, English citations
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