The theory of nonequilibrium Anderson impurity model for strongly correlated electron systems
V.A. Moskalenko1,2, L.A. Dohotaru3,1, and D.F. Digor1
1Institute of Applied Physics, Moldova Academy of Sciences, Chisinau 2028, Moldova
2 Bogolyubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna 141980, Russia
3Technical University, Chisinau 2004, Moldova
Received October 15, 2014
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; PACS: 71.10.Fd Lattice fermion models.