Electronic reconstruction at the isopolar LaTiO3/LaFeO3 interface: An   x-ray photoemission and density functional theory study
  We report the formation of a non-magnetic band insulator at the isopolar interface between the antiferromagnetic Mott-Hubbard insulator LaTiO3 and the antiferromagnetic charge transfer insulator LaFeO3. By density functional theory calculations, we find that the formation of this interface state is driven by the combination of O band alignment and crystal field splitting energy of the t2g and eg bands. As a result of these two driving forces, the Fe 3d bands rearrange and electrons are transferred from Ti to Fe. This picture is supported by x-ray photoelectron spectroscopy, which confirms the rearrangement of the Fe 3d bands and reveals an unprecedented charge transfer up to 1.2+/-0.2 e-/interface unit cell in our LaTiO3/LaFeO3 heterostructures. 
J. E. Kleibeuker, Z. Zhong, H. Nishikawa, J. Gabel, A. M\"uller, F.   Pfaff, M. Sing, K. Held, R. Claessen, G. Koster, and ...
cond-mat.str-el cond-mat.mtrl-sci