1210.7497 (Pouya Moetakef et al.)

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

Pouya Moetakef, Clayton A. Jackson, Jinwoo Hwang, Leon Balents, S. James Allen, Susanne Stemmer

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.

View original: http://arxiv.org/abs/1210.7497