Oxide superlattices with alternating p and n interfaces

Abstract

The physics of oxide superlattices is considered for pristine (001) multilayers of the band insulators LaAlO3 and SrTiO3 with alternating p and n interfaces. First principles results and a model of capacitor plates offer a simple paradigm to understand their dielectric properties and the insulator to metal transition (IMT) at interfaces with increasing layer thickness. The charge at insulating interfaces is found to be as predicted from the formal ionic charges, not populations. Different relative layer thicknesses produce a spontaneous polarization of the system, and allow manipulation of the interfacial electron gas. Large piezoresistance effects can be obtained from the sensitivity of the IMT to lateral strain. Carrier densities are found to be ideal for exciton condensation.

5 pages, 4 pdf figures, 1 added figure and additional references and discussions

References in corpus (9)

• The SIESTA method for ab initio order-N materials simulation
• Efficient index handling of multidimensional periodic boundary conditions
• Selfconsistent order-N density-functional calculations for very large systems
• Why Some Interfaces Cannot be Sharp
• Mapping the Spatial Distribution of Charge Carriers in LaAlO3/SrTiO3 Heterostructures
• Avoiding the polarization catastrophe in LaAlO3 overlayers on SrTiO3(001) through a polar distortion
• Systematic generation of finite-range atomic basis sets for linear-scaling calculations
• Tunability of the dielectric response of epitaxially strained SrTiO3 from first principles
• Fundamental asymmetry in interfacial electronic reconstruction between insulating oxides

Cited by in corpus (27)

• Built-in and induced polarization across LaAlO${}_3$/SrTiO${}_3$ heterojunctions
• Surface defects and conduction in polar oxide heterostructures
• Origin of two-dimensional electron gases at oxide interfaces: insights from theory
• Polarity-induced oxygen vacancies at LaAlO3|SrTiO3 interfaces
• First-principles modeling of electrostatically doped perovskite systems
• Berry-phase theory of polar discontinuities at oxide-oxide interfaces
• Localized vs. delocalized character of charge carriers in LaAlO3/ SrTiO3 superlattices
• Ferroelectric Dead Layer Driven by a Polar Interface
• Prediction of thickness limits of ideal polar ultrathin films
• Phase diagrams of voltage-gated oxide interfaces with strong Rashba coupling
• Charge density distribution and optical response of the LaAlO3/SrTiO3 interface
• Two-dimensional electron gas at the PbTiO${}_3$/SrTiO${}_3$ interface: an ab initio study
• Enhanced two dimensional electron gas charge densities at III-III/I-V oxide heterostructure interfaces
• One-dimensional half-metallic interfaces of two-dimensional honeycomb insulators
• Model of two-dimensional electron gas formation at ferroelectric interfaces
• Electron-Hole Liquids in Transition Metal Oxide Heterostructures
• Thickness Dependent Carrier Density at the Surface of SrTiO3 (111) Slabs
• Ab initio design of charge-mismatched ferroelectric superlattices
• Proposal of a one-dimensional electron gas in the steps at the LaAlO${}_3$-SrTiO${}_3$ interface
• The net charge at interfaces between insulators
• Electronic Phases and Phase Separation in the Hubbard-Holstein Model of a Polar Interface
• Giant magnetoelectric effect in pure manganite-manganite heterostructures
• Piezoelectric properties of ferroelectric perovskite superlattices with polar discontinuity
• Nitride Multilayers as a Platform for Parallel Two-Dimensional Electron-Hole Gases: MgO/ScN(111)
• Structural and electronic phenomena at oxyfluoride KTaO${}_3$/K$M$F${}_3$ ($M$ = Zn and Ni) superlattices: Rashba splitting and 2DEG
• Piezoelectric properties of II-IV/I-V and II-IV/III-III ferroelectric perovskite superlattices
• General considerations of the electrostatic boundary conditions in oxide heterostructures