Fig. 1: Spin states of Co ions and electronic band structure of LCO/LTO.
From: Three dimensional band-filling control of complex oxides triggered by interfacial electron transfer
a–d Spin states of Co ions. Δcf, crystal field splitting, Δex, intra-atomic exchange energy. e Schematic diagram of 30u.c.-LaCoO3 (LCO)/n-LaTiO3 (LTO) heterostructure grown on SrTiO3 (STO) substrate. We refer to this heterostructure as C30/Tn. The black arrow indicates the shared oxygen sites at the interface. f Electronic band structures of LCO and LTO. EF, Fermi level; Δeff, charge-transfer gap; Ueff, Mott–Hubbard gap. g The final equilibrium state wherein the ΔEF can be removed by charge transfer from Ti to Co. ΔΦ, electrostatic potential drop.
