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Teoreticheskaya i Matematicheskaya Fizika, 2011, Volume 168, Number 3, Pages 490–502
DOI: https://doi.org/10.4213/tmf6696 (Mi tmf6696) 		 
This article is cited in 2 scientific papers (total in 2 papers)

The diagram theory for the degenerate two-orbital Hubbard model

V. A. Moskalenkoab, L. A. Dohotaruc, I. D. Chebotar'b, D. F. Digorb

a Joint Institute for Nuclear Research, Dubna, Moscow Oblast, Russia
b Institute for Applied Physics, Moldovian Academy of Sciences, Kishinev, Moldova
c Moldovian Technical University, Kishinev, Moldova
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DOI: https://doi.org/10.4213/tmf6696
Abstract: We investigate the minimal model that takes orbital degrees of freedom into account: the degenerate two-orbital Hubbard model. Our consideration includes the intraatomic Coulomb interaction of two electrons with opposite spins on the same orbital and on different orbitals and interorbital hopping of tunneling electrons. We take the influence of states caused by Hund's rule coupling on the metal–insulator phase transition into account. We generalize the diagram theory developed for strongly correlated orbitally nondegenerate systems to the case of orbital degeneration. For the one-particle renormalized Green's function, we establish an equation of Dyson type for calculating the system spectral function using a simple approximation based on summing chain diagrams.
Keywords: strongly correlated electron system, Dyson equation, Green's function, degenerate Hubbard model.
Received: 09.02.2011
English version:
Theoretical and Mathematical Physics, 2011, Volume 168, Issue 3, Pages 1278–1289
DOI: https://doi.org/10.1007/s11232-011-0105-z
Bibliographic databases:
Document Type: Article
Language: Russian
Citation: V. A. Moskalenko, L. A. Dohotaru, I. D. Chebotar', D. F. Digor, “The diagram theory for the degenerate two-orbital Hubbard model”, TMF, 168:3 (2011), 490–502; Theoret. and Math. Phys., 168:3 (2011), 1278–1289
Citation in format AMSBIB
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    • This publication is cited in the following 2 articles:
    Citing articles in Google Scholar: Russian citations, English citations
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    		Теоретическая и математическая физика Theoretical and Mathematical Physics
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