The influence of nonlocal hybridization on ground-state properties of the Falicov–Kimball model

Abstract

The density matrix renormalization group is used to examine effects of nonlocal hybridization on ground-state properties of the Falicov–Kimball model (FKM) in one dimension. Special attention is devoted to the problem of hybridization-induced insulator–metal transition. It is shown that the picture of insulator–metal transitions found for the FKM with nonlocal hybridization strongly differs from one found for the FKM without hybridization (as well as with local hybridization). The effect of nonlocal hybridization is so strong that it can induce the insulator–metal transition, even in the half-filled band case where the ground states of the FKM without hybridization are insulating for all finite Coulomb interactions. Outside the half-filled band case the metal–insulator transition driven by pressure is found for finite values of nonlocal hybridization.