Electronic Transport in Ion Gel-Gated Strontium Titanate*

In recent years much attention has been focused on the structure and properties of two-dimensional electron liquids (2DEL) in complex oxide heterostrucutres and delta- doped layers. We report on the fabrication and measurements of mesoscopic devices of metal oxides, with focus given to an electric field-induced 2DEL at the surface of undoped strontium titanate (STO). We describe the design and fabrication of field- effect structures, gated with an ionic gel, and show the measurements of induced swings of charge carrier density in STO. Other transport properties of the 2DEL are studied by magneto-transport measurements at low temperature.