title: Origin of the two-dimensional electron gas carrier density at the LaAlO3 on SrTiO3 interface.
abstract: Transport measurements of the two-dimensional electron gas at the LaAlO3-SrTiO3 interface have found a density of carriers much lower than expected from the "polar catastrophe" arguments. From a detail density-functional study, we suggest how this discrepancy may be reconciled. We find that electrons occupy multiple subbands at the interface leading to a rich array of transport properties. Some electrons are confined to a single interfacial layer and susceptible to localization, while others with small masses and extended over several layers are expected to contribute to transport.
authors.affiliation: Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801, USA.
authors.forename: Zoran S
authors.initials: ZS
authors.lastname: Popović
authors.forename: Sashi
authors.initials: S
authors.lastname: Satpathy
authors.forename: Richard M
authors.initials: RM
authors.lastname: Martin