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Browsing Articole din publicaţii internaţionale by Author "MOSKALENKO, V. A."

Browsing Articole din publicaţii internaţionale by Author "MOSKALENKO, V. A."

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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 ...
  • Diagram analysis of the Hubbard model: Stationarity property of the thermodynamic potential 
    MOSKALENKO, V. A.; DOHOTARU, L. A.; CEBOTARI, I. D. (Springer Nature Switzerland, 2010)
    The diagram approach proposed many years ago for the strongly correlated Hubbard model is developed with the aim to analyze the thermodynamic potential properties. A new exact relation between renormalized quantities such ...
  • 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 periodic Anderson model: Stationarity of the thermodynamic potential 
    MOSKALENKO, V. A.; DOHOTARU, L. A.; CITRO, R. (Springer Nature Switzerland, 2010)
    We develop a diagram theory for the periodic Anderson model assuming that the Coulomb repulsion of localized f electrons is the main parameter of the theory. The f electrons are strongly correlated and the c conduction ...
  • 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 analysis of the Hubbard model: Stationary property of the thermodynamic potential 
    MOSKALENKO, V. A.; DOHOTARU, L. A. (Springer Nature Switzerland, 2010)
    Diagrammatic approach proposed many years ago for strong correlated Hubbard model is developed for analyzing of the thermodynamic potential properties. The new exact relation between such renormalized quantities as ...
  • 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 periodic Anderson model 
    MOSKALENKO, V. A.; DOHOTARU, L. A. (Springer Nature Switzerland, 2010)
    Diagrammatic theory for Periodic Anderson Model has been developed, supposing the Coulomb repulsion of f — localized electrons as a main parameter of the theory. f-Electrons are strongly correlated and c-conduction electrons ...
  • Diagrammatic theory for the Anderson impurity model: Stationary property of the thermodynamic potential 
    MOSKALENKO, V. A.; ENTEL, P.; DOHOTARU, L. A.; CITRO, R. (Springer Nature Switzerland, 2009)
    We propose a diagrammatic theory around the atomic limit for the normal state of the Anderson impurity model. The new diagram method is based on Wick’s theorem for conduction electrons and a generalized Wick’s theorem for ...
  • 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 ...
  • 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 ...
  • Phenomenologic versus microscopic description of the nanoparticle magnetization 
    COJOCARU, S.; DOHOTARU, L. A.; MOSKALENKO, V. A. (Institutul de Fizică Aplicată al AŞM, 2012)
    We have shown that experimental data are reproduced equally well, but in this case the physical behavior can be understood in terms of the magnon gas concept. In the present work a further development of the microscopic ...
  • Shape Anisotropy and Magnetization of Ferromagnetic Nanostructures 
    COJOCARU, S.; DOHOTARU, L. A.; MOSKALENKO, V. A. (American Scientific Publishers, 2012)
    The temperature dependence of the spontaneous magnetization in rectangular ferromagnetic nanostructures is derived in the framework of a quantum microscopic approach taking into account discreetness of excitation spectrum. ...
  • 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 ...

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