  We report on the fabrication of all perovskite Mott insulator/band insulator
YTiO3/CaTiO3 superlattices by pulsed laser deposition. The combination of in
situ reflection high energy electron diffraction, X-ray diffraction, and X-ray
reflectivity confirms the high quality of the films grown in a layer-by-layer
mode. Electrical transport measurements reveal that a non-SrTiO3 based two
dimensional electron gas system has formed at the YTiO3/CaTiO3 interface. These
studies offer another route in the pursuit of complex oxide two-dimensional
electron gas systems, which allows to obtain greater insights into the exotic
many-body phenomena at such interfaces.
