Charge transfer in heterostructures of strongly correlated materials

Abstract

In this work, recent theoretical investigations by the authors in the area of oxidemultilayers are briefly reviewed. The calculations were carried out using modelHamiltonians and a variety of non-perturbative techniques. Moreover, new results are alsoincluded here. They correspond to the generation of a metallic state by mixinginsulators in a multilayer geometry, using the Hubbard and double-exchangemodels. For the latter, the resulting metallic state is also ferromagnetic. Thisillustrates how electron or hole doping via transfer of charge in multilayers canlead to the study of phase diagrams of transition metal oxides in the clean limit.Currently, these phase diagrams are much affected by the disordering standardchemical doping procedure, which introduces quenched disorder in the material.