Electron doping of cuprates via interfaces with manganites

The possible electron doping of some undoped high-$T_c$ cuprates via the transfer of charge from undoped manganites (or other oxides) using heterostructure geometries is discussed theoretically [1]. An analysis of photoemission and diffusion voltage experiments locate the Fermi level of some manganites above the bottom of the upper Hubard band of some cuprate parent compounds. The addition of electrons to antiferromagnetic Cu oxides may lead to a superconducting state at the interface with minimal quenched disorder. Model calculations support this view. [1] S. Yunoki et al., Phys. Rev. B {\bf 76}, 064532 (2007) and references therein.