Fractionally delta-doped oxide superlattices for higher carrier mobilities

Abstract

A 2D electron gas system in an oxide heterostructure serves as an important playground for novel phenomena. Here, we show that, by using fractional delta-doping to control the interface's composition in LaxSr1-xTiO3/SrTiO3 artificial oxide superlattices, the filling-controlled 2D insulator-metal transition can be realized. The atomic-scale control of d-electron band filling, which in turn contributes to the tuning of effective mass and density of the charge carriers, is found to be a fascinating route to substantially enhanced carrier mobilities.

arXiv comment14 pages, 4 figures, Nano Letters published online (2012)

References in corpus (10)

• Creation and control of a two-dimensional electron liquid at the bare SrTiO3 surface
• Nonlinear Hall effect and multichannel conduction in LaTiO3/SrTiO3 superlattices
• Spatial inhomogeneity and strong correlation physics: a dynamical mean field study of a model Mott-insulator/band-insulator heterostructure
• Multiple conducting carriers generated in LaAlO3/SrTiO3 heterostructures
• Growth mode control of the free carrier density in SrTiO3-d films
• Optical Study of the Free Carrier Response of LaTiO3/SrTiO3 Superlattices
• Dimensional crossover of polaron dynamics in Nb:SrTiO3/SrTiO3 superlattices: Possible mechanism of thermopower enhancement
• Metallic interface at the boundary between band and Mott insulators
• Enhanced two dimensional electron gas charge densities at III-III/I-V oxide heterostructure interfaces
• Tunable 2-dimensional/3-dimensional electron gases by submonolayer La doping of SrTiO_{3}

Cited by in corpus (10)

• Quasiparticle dynamics and spin-orbital texture of the SrTiO3 two-dimensional electron gas
• Emerging magnetism and anomalous Hall effect in iridate-manganite heterostructures
• Liquid-Gated High Mobility and Quantum Oscillation of the Two-Dimensional Electron Gas at an Oxide Interface
• Resonant tunneling in a quantum oxide superlattice
• Synergetic Behavior in 2D Layered Material/Complex Oxide Heterostructures
• Thermopower enhancement by fractional layer control in 2D oxide superlattices
• Correlated Quantum Phenomena of Spin-Orbit Coupled Perovskite Oxide Heterostructures: Cases of SrRuO3 and SrIrO3-Based Artificial Superlattices
• Towards Mott design by $\delta$-doping of strongly correlated titanates
• Electron gas induced in SrTiO${}_3$
• Ex-situ atomic force microscopy on the growth mode of SrRuO3 epitaxial thin film