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In recent years, striking discoveries have revealed that two-dimensionalelectron liquids (2DEL) confined at the interface between oxide band-insulatorscan be engineered to display a high mobility transport. The recognition thatonly few interfaces appear to suit hosting 2DEL is intriguing and challengesthe understanding of these emerging properties not existing in bulk. Indeed,only the neutral TiO2 surface of (001)SrTiO3 has been shown to sustain 2DEL. Weshow that this restriction can be surpassed: (110) and (111) surfaces of SrTiO3interfaced with epitaxial LaAlO3 layers, above a critical thickness, display2DEL transport with mobilities similar to those of (001)SrTiO3. Moreover weshow that epitaxial interfaces are not a prerequisite: conducting (110)interfaces with amorphous LaAlO3 and other oxides can also be prepared. Thesefindings open a new perspective both for materials research and for elucidatingthe ultimate microscopic mechanism of carrier doping.

High mobility conduction at (110) and (111) LaAlO3/SrTiO3 interfaces