Toward an artificial Mott insulator: Correlations in confined high-density electron liquids in SrTiO3
Published Web Locationhttp://link.aps.org/doi/10.1103/PhysRevB.86.201102
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.