We identified spectral signature of charge transfer from insulating LaMnO3 into metallic LaNiO3, which causes a metal-insulator transition in the LaNiO3 layers in LaMnO3/LaNiO3 superlattices. This interfacial-charge transfer is a technique for doping a material without introducing disorder. We expect that this better understanding how charge transfer at interfaces can be used to create novel electronic phases will lead to new materials design principles.
Spectral Weight Redistribution in (LaNiO3)n/(LaMnO3)2 Superlattices from Optical Spectroscopy,
P. Di Pietro, J. Hoffman, A. Bhattacharya, S. Lupi, and A. Perucchi,
Phys. Rev. Lett. 114, 156801 (2015).