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apr11-offprint-cavaglia.pdf

Electronic states with unusual properties can be promoted at interfaces between complex oxides. A particularly fascinating system is the interface between band insulators LaAlO3 and SrTiO3, which displays conductivity with high mobility and two-dimensional superconductivity. In this paper, field effect experiments performed on this system will be reviewed. Using the electrostatic tuning of the carrier density, the phase diagram of the system has been explored, revealing a quantum phase trans-ition between a two-dimensional super-conducting state and an insulating state.