Toward an artificial Mott insulator: Correlations in confined,   high-density electron liquids in SrTiO3
  We investigate correlation physics in high-density, two-dimensional electron liquids that reside in narrow SrTiO3 quantum wells. The quantum wells are remotely doped via an interfacial polar discontinuity and the three-dimensional (3D) carrier density is modulated by changing the width of the quantum well. It is shown that even at 3D densities well below one electron per site, short-range Coulomb interactions become apparent in transport, and an insulating state emerges at a critical density. We also discuss the role of disorder in the insulating state. 
Pouya Moetakef, Clayton A. Jackson, Jinwoo Hwang, Leon Balents, S.   James Allen, and Susanne Stemmer
cond-mat.str-el cond-mat.mes-hall