ELECTRONIC STRUCTURE FOR THE TWO-BAND HUBBARD MODEL OF THE LADDER α′-NaV2O5 COMPOUND

Abstract

An effective Hubbard model for one-particle d-like states and two-particle singlet states is derived in order to describe the low-energy electronic spectrum in ladder α′- NaV 2 O 5 compound. The energy shifts and the renormalized hopping parameters for the considered electronic states are calculated on the basis of the projection technique for the two-time matrix Green's function in terms of Hubbard operators.