Low Temperature Physics: 41, 401 (2015); https://doi.org/10.1063/1.4919378
Физика Низких Температур: Том 41, Выпуск 5 (Май 2015), c. 514-519
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The theory of nonequilibrium Anderson impurity model for strongly correlated electron systemsV.A. Moskalenko^{1,2}, L.A. Dohotaru^{3,1}, and D.F. Digor^{1} ^{1}Institute of Applied Physics, Moldova Academy of Sciences, Chisinau 2028, Moldova ^{2} Bogolyubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna 141980, Russia ^{3}Technical University, Chisinau 2004, Moldova Received October 15, 2014 Аннотация 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 of electron operators by generalizing Keldysh formalism. Perturbation expansion is realized for Anderson impurity model in which we consider the Coulomb interaction of the impurity electrons as a main parameter of the model and the mixing interaction between impurity and conduction electrons as a perturbation. The first two approximations are used and is obtained the value of the current between one of the leads and central region of interacting electrons. The contribution of the strong correlations and of irreducible diagrams is analyzed. PACS: 71.27.+a Strongly correlated electron systems; heavy fermions; Ключевые слова: Keldysh diagram technique, nonequilibrium state, Green’s function, Anderson impurity model. Published online: March 23, 2015 |