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Browsing Articole din publicaţii internaţionale by Author "DIGOR, D. F."

Browsing Articole din publicaţii internaţionale by Author "DIGOR, D. F."

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  • Competing spin waves and superconducting fluctuations in strongly correlated electron systems 
    MOSKALENKO, V. A.; ENTEL, P.; DIGOR, D. F.; DOHOTARU, L. A. (Taylor & Francis, 2005)
    A special diagram technique recently proposed for strongly correlated electron systems is used to study the pecularities of a spindensity-wave (SDW) in competition with superconductivity. This method allows to formulate ...
  • A diagram approach to the strong coupling in the single-impurity Anderson model 
    MOSKALENKO, V. A.; ENTEL, P.; DIGOR, D. F.; DOHOTARU, L. A.; CITRO, R. (Springer Nature Switzerland, 2008)
    We propose a diagram theory around the atomic limit for the single-impurity Anderson model in which the strongly correlated impurity electrons hybridize with free (uncorrelated) conduction electrons. Using this diagram ...
  • The diagram theory for the degenerate two-orbital Hubbard model 
    MOSKALENKO, V. A.; DOHOTARU, L. A.; CHEBOTAR’, I. D.; DIGOR, D. F. (Springer Nature Switzerland, 2011)
    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 ...
  • Diagram theory for the twofold-degenerate Anderson impurity model 
    MOSKALENKO, V. A.; DOHOTARU, L. A.; DIGOR, D. F.; CEBOTARI, I. D. (Springer Nature Switzerland, 2014)
    We develop a diagram technique for investigating the twofold-degenerate Anderson impurity model in the normal state with the strong electronic correlations of d electrons of the impurity ion taken into account. We discuss ...
  • Diagrammatic analysis of the Hubbard model II: Superconducting state 
    MOSKALENKO, V. A.; DOHOTARU, L. A.; DIGOR, D. F.; CEBOTARI, I. D. (Cornell Univesity, 2010)
    Diagrammatic analysis for normal state of Hubbard model proposed in our previous paper[1] is generalized and used to investigate superconducting state of this model. We use the notion of charge quantum number to describe ...
  • Diagrammatic approach for Impurity Anderson Model 
    MOSKALENKO, V. A.; DOHOTARU, L. A.; ENTEL, P.; DIGOR, D. F. (Institutul de Fizică Aplicată, AŞM, 2006)
    Impurity Anderson Model is the model for a system of conduction electrons that interact with a local spin as just another electrons in f – orbitals. The Hamiltonian of the system contains hybridization interaction between ...
  • Diagrammatic theory for twofold degenerate Anderson impurity model 
    MOSKALENKO, V. A.; DOHOTARU, L. A.; DIGOR, D. F.; CEBOTARI, I. D. (Institutul de Fizică Aplicată al AŞM, 2012)
    We study the influence of the intra-atomic Coulomb interactions of the two electrons with opposite spins situated on the same or different orbitals and intra-atomic exchange is analyzed. We discuss the properties of the ...
  • Dynamics of phonon clouds of correlated polarons 
    MOSKALENKO, V. A.; DOHOTARU, L. A.; DIGOR, D. F.; CEBOTARI, I. D. (Springer Nature Switzerland, 2014)
    We investigate the Anderson-Holstein model with strong repulsion of impurity electrons using a strongcoupling approximation. The strong electron-phonon interaction determines the formation of polarons with heavy clouds of ...
  • Dynamics of the phonon clouds for Anderson-Holstein model 
    MOSCALENCO, V. A.; DOHOTARU, L. A.; DIGOR, D. F.; CEBOTARI, I. D. (Academia de Ştiinţe a Moldovei, 2014)
    We have formulated the system of Dyson-type equations which determines the relation between the full propagators of impurity electrons and their correlation functions. We have also found the system of Dyson equations for ...
  • A novel diagrammatic technique for the single-site Anderson model 
    MOSKALENKO, V. A.; ENTEL, P.; DIGOR, D. F.; DOHOTARU, L. A.; CITRO, R. (Cornel Univesity, 2007)
    A diagrammatic theory around the atomic limit is proposed for the single-impurity Anderson model in which the strongly correlated impurity electrons hybridize with free (uncorrelated) conduction electrons. Using this ...
  • Single-site Anderson Model. I Diagrammatic theory 
    MOSKALENKO, V. A.; ENTEL, P.; DIGOR, D. F.; DOHOTARU, L. A.; CITRO, R. (Cornell Univesity, 2007)
    The diagrammatic theory is proposed for the strongly correlated impurity Anderson model. The strongly correlated impurity electrons are hybridized with free conduction electrons. For this system the new diagrammatic approach ...
  • Single-site Anderson model. II Perturbation theory of symmetric model 
    MOSKALENKO, V. A.; ENTEL, P.; DIGOR, D. F.; DOHOTARU, L. A.; CITRO, R. (Cornell Univesity, 2007)
    The strong electron correlations caused by Coulomb interaction of impurity electrons are taken into account. The infinite series of diagrams containing irreducible Green’s functions are summed. For symmetric Anderson model ...
  • Stationary property of the thermodynamic potential of the Hubbard model in strong coupling diagrammatic approach for superconducting state 
    MOSKALENKO, V. A.; DOHOTARU, L. A.; DIGOR, D. F.; CEBOTARI, I. D. (AIP Publishing LLC, 2012)
    Diagrammatic analysis for normal state of Hubbard model proposed in our previous paper is generalized and used to investigate superconducting state of this model. We use the notion of charge quantum number to describe the ...
  • Strong coupling diagrammatic approach to the Anderson-Holstein hamiltonian 
    MOSKALENKO, V. A.; DOHOTARU, L. A.; DIGOR, D. F.; CEBOTARI, I. D. (The Publishing House of the Romanian Academy, 2014)
    We develop a strong-coupling approach to investigate the Anderson-Holstein model with strong repulsion on impurity centers. We derive the relation between electron propagators and correlation functions and prove that for ...
  • The theory of nonequilibrium Anderson impurity model for strongly correlated electron systems 
    MOSKALENKO, V. A.; DOHOTARU, L. A.; DIGOR, D. F. (AIP Publishing LLC, 2015)
    The nonequilibrium theory of strongly correlated systems is proposed theory which is grounded on the generalized Wick theorem. This theorem is employed for calculation of the thermal averages of the contour arranged products ...
  • Two impurities model of strongly correlated electron systems 
    MOSCALENCO, V. A.; DOHOTARU, L. A.; DIGOR, D. F.; CEBOTARI, I. D. (Institutul de Fizică Aplicată, 2016)
    There are many systems with strongly correlated electrons where there is also a strong coupling to the lattice, manganites and fullerides. The strong electron-electron interactions can be described by Hubbard and Anderson ...
  • Two particle irreducible green’s function of strongly correlated electron systems 
    MOSCALENCO, V. A.; DOHOTARU, L. A.; DIGOR, D. F.; CEBOTARI, I. D. (Institutul de Fizică Aplicată, 2016)
    As was demonstrated in our previous papers devoted to the theory of strongly correlated electron systems the new elements of such theory are the irreducible Green’s functions or Kubo cumulants. These functions contain all ...

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