High mobility conduction at (110) and (111) LaAlO3/SrTiO3 interfaces

Abstract

In recent years, striking discoveries have revealed that two-dimensional electron liquids (2DEL) confined at the interface between oxide band-insulators can be engineered to display a high mobility transport. The recognition that only few interfaces appear to suit hosting 2DEL is intriguing and challenges the understanding of these emerging properties not existing in bulk. Indeed, only the neutral TiO2 surface of (001)SrTiO3 has been shown to sustain 2DEL. We show that this restriction can be surpassed: (110) and (111) surfaces of SrTiO3 interfaced with epitaxial LaAlO3 layers, above a critical thickness, display 2DEL transport with mobilities similar to those of (001)SrTiO3. Moreover we show that epitaxial interfaces are not a prerequisite: conducting (110) interfaces with amorphous LaAlO3 and other oxides can also be prepared. These findings open a new perspective both for materials research and for elucidating the ultimate microscopic mechanism of carrier doping.

Published in Scientific Reports (open access jounal of the Nature Publishing Group)

References in corpus (13)

• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface
• Coexistence of Magnetic Order and Two-dimensional Superconductivity at LaAlO${}_3$/SrTiO${}_3$ Interfaces
• Unveiling a two-dimensional electron gas with universal subbands at the surface of SrTiO3
• High Mobility in LaAlO3/SrTiO3 Heterostructures: Origin, Dimensionality and Perspectives
• Origin of charge density at LaAlO3-on-SrTiO3 hetero-interfaces; possibility of intrinsic doping
• Metallic and insulating interfaces of amorphous SrTiO3-based oxide heterostructures
• Profiling the interface electron gas of LaAlO3/SrTiO3 heterostructures by hard X-ray photoelectron spectroscopy
• Instability, Intermixing and Electronic Structure at the Epitaxial LaAlO3/SrTiO3(001) Heterojunction
• Polar Discontinuity Doping of the LaVO_3/SrTiO_3 Interface
• Rewritable nanoscale oxide photodetector
• Conducting interfaces between band insulating oxides: the LaGaO3/SrTiO3
• Thickness dependence of the mobility at the LaAlO_3 / SrTiO_3 interface

Cited by in corpus (56)

• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Origin of the two-dimensional electron gas at LaAlO3/SrTiO3 interfaces: The role of oxygen vacancies and electronic reconstruction
• Origin of two-dimensional electron gases at oxide interfaces: insights from theory
• Control of a two-dimensional electron gas on SrTiO3(111) by atomic oxygen
• Atomically flat single terminated oxide substrate surfaces
• Massive symmetry breaking in LaAlO${}_3$/SrTiO${}_3$(111) quantum wells: a three-orbital, strongly correlated generalization of graphene
• Two-dimensional superconductivity at the (111)LaAlO${}_3$/SrTiO${}_3$ interface
• Orientational tuning of the Fermi sea of confined electrons at the SrTiO3 (110) and (111) surfaces
• Six-fold crystalline anisotropic magnetoresistance in the (111) LaAlO${}_3$/SrTiO${}_3$ oxide interface
• Designing spin and orbital sources of Berry curvature at oxide interfaces
• Observation of Quantum Griffiths Singularity and Ferromagnetism at Superconducting LaAlO3/SrTiO3(110) Interface
• Link between the Superconducting Dome and Spin-Orbit Interaction in the (111) LaAlO${}_3$/SrTiO${}_3$ Interface
• Topological phases in layered pyrochlore oxide thin films along the [111] direction
• Mott Electrons in an Artificial Graphenelike Crystal of Rare-Earth Nickelate
• The Effect of Polar Fluctuation and Lattice Mismatch on Carrier Mobility at Oxide Interfaces
• Ferromagnetism in itinerant two-dimensional t2g systems
• Lattice distortion effects on topological phases in (LaNiO${}_3$)${}_2$/(LaAlO${}_3$)${}_N$ heterostructures grown along the [111] direction
• Fabrication of (111)-oriented Ca0.5Sr0.5IrO3/SrTiO3 superlattices; a designed playground for honeycomb physics
• Microscopic origin of the mobility enhancement at a spinel/perovskite oxide heterointerface revealed by photoemission spectroscopy
• Selection rules for Cooper pairing in two-dimensional interfaces and sheets
• Gate Tunable In- and Out-Of-Plane Spin-Orbit Coupling and Spin Splitting Anisotropy at LaAlO3/SrTiO3 (110) Interface
• Perspective: Strongly correlated and topological states in [111] grown transition metal oxide thin films and heterostructures
• Strain-induced Defect Superstructure on the SrTiO3(110) Surface
• Mechanism, time-reversal symmetry and topology of superconductivity in noncentrosymmetric systems
• Band inversion driven by electronic correlations at the (111) LaAlO${}_3$/SrTiO${}_3$ interface
• Large band offset as driving force of 2-dimensional electron confinement: the case of SrTiO${}_3$/SrZrO${}_3$ interface
• Geometrical lattice engineering of complex oxide heterostructures: a designer approach to emergent quantum states
• Symmetry and correlation effects on band structure explain the anomalous transport properties of (111) LaAlO${}_3$/SrTiO${}_3$
• Anisotropic, multi-carrier transport at the (111) LaAlO${}_3$/SrTiO${}_3$ interface
• Origin of interfacial conductivity at complex oxide heterointerfaces: possibility of electron transfer from water chemistry at surface oxygen vacancies
• Thickness Dependent Carrier Density at the Surface of SrTiO3 (111) Slabs
• Upper critical field as a probe for multiband superconductivity in bulk and interfacial STO
• Evolution of the SrTiO${}_3$ surface electronic state as a function of LaAlO${}_3$ overlayer thickness
• Symmetry breaking at the (111) interfaces of SrTiO${}_3$ hosting a 2D-electron system
• Two-dimensional electron-gas-like charge transport at magnetic Heusler alloy-SrTiO${}_3$ interface
• Infrared ellipsometry study of the confined electrons in a high-mobility $\gamma$-Al${}_2$O${}_3$/SrTiO${}_3$ heterostructure
• 2D surprises at the surface of 3D materials: confined electron systems in transition metal oxides
• Anisotropic Electronic Structure of the Two-Dimensional Electron Gas at the AlOx/KTaO3(110) interface
• Ferroelectricity in [111]-oriented epitaxially strained SrTiO${}_3$ from first principles
• Universality of Electron Mobility in LaAlO${}_3$/SrTiO${}_3$ and bulk SrTiO${}_3$
• Termination-dependent Electronic and Magnetic Properties of Ultrathin SrRuO${}_3$ (111) Film on SrTiO${}_3$
• Infrared ellipsometry study of the photo-generated charge carriers at the (001) and (110) surfaces of SrTiO${}_3$ crystals and the interface of corresponding LaAlO${}_3$/SrTiO${}_3$ heterostructures
• Epitaxial Growth of (1 1 1)-Oriented Spinel CoCr${}_2$O${}_4$/Al${}_2$O${}_3$ Heterostructures
• Conducting interfaces between amorphous oxide layers and SrTiO3(110) and SrTiO3(111)
• Crystalline symmetry-dependent magnon formation in itinerant ferromagnet SrRuO3
• Strain-induced topological phase transition at (111) SrTiO${}_3$-based heterostructures
• Vortex excitations in the Insulating State of an Oxide Interface
• La interstitial defect-induced insulator-metal transition in oxide heterostructures LaAlO3/SrTiO3
• Gate voltage control of the $Al{O}_x$/$SrTi{O}_3$ interface electrical properties
• Electrostatic tuning of magnetism at the conducting (111) (La${}_{0.3}$Sr${}_{0.7}$)(Al${}_{0.65}$Ta${}_{0.35}$)/SrTiO${}_3$ interface
• Imprinted atomic displacements drive spin-orbital order in a vanadate perovskite
• High stability 2D electron gases formed in Si3N4/Al//KTaO3 heterostructures: synthesis and in-depth interfacial characterization
• Low temperature magnetoresistance of (111) (La${}_{0.3}$Sr${}_{0.7}$)(Al${}_{0.65}$Ta${}_{0.35}$)/SrTiO${}_3$
• Anisotropic electronic transport and Rashba effect of the two-dimensional electron system in (110) SrTiO${}_3$-based heterostructures
• Study and characterization of SrTiO3 surface
• Strong spin-orbit coupling and magnetism in (111) (La${}_{0.3}$Sr${}_{0.7}$)(Al${}_{0.65}$Ta${}_{0.35})$/SrTiO${}_3$