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We investigate correlation physics in high-density, two-dimensional electronliquids that reside in narrow SrTiO3 quantum wells. The quantum wells areremotely doped via an interfacial polar discontinuity and the three-dimensional(3D) carrier density is modulated by changing the width of the quantum well. Itis shown that even at 3D densities well below one electron per site,short-range Coulomb interactions become apparent in transport, and aninsulating state emerges at a critical density. We also discuss the role ofdisorder in the insulating state.

Toward an artificial Mott insulator: Correlations in confined, high-density electron liquids in SrTiO3