Towards two-dimensional metallic behavior at LaAlO3/SrTiO3 interfaces

Abstract

Using a low-temperature conductive-tip atomic force microscope in cross-section geometry we have characterized the local transport properties of the metallic electron gas that forms at the interface between LaAlO3 and SrTiO3. At low temperature, we find that the carriers do not spread away from the interface but are confined within ~10 nm, just like at room temperature. Simulations taking into account both the large temperature and electric-field dependence of the permittivity of SrTiO3 predict a confinement over a few nm for sheet carrier densities larger than ~6 10^13 cm-2. We discuss the experimental and simulations results in terms of a multi-band carrier system. Remarkably, the Fermi wavelength estimated from Hall measurements is ~16 nm, indicating that the electron gas in on the verge of two-dimensionality.

Accepted for publication in Physical Review Letters

References in corpus (6)

• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• High Mobility in LaAlO3/SrTiO3 Heterostructures: Origin, Dimensionality and Perspectives
• Origin of charge density at LaAlO3-on-SrTiO3 hetero-interfaces; possibility of intrinsic doping
• Oxide spintronics
• Suppressed magnetization in La${}_{0.7}$Ca${}_{0.3}$MnO${}_3$/YBa${}_2$Cu${}_3$O${}_{7-\delta }$ superlattices
• Electron gas at the interface between two antiferromagnetic insulating manganites

Cited by in corpus (69)

• Tunable Rashba spin-orbit interaction at oxide interfaces
• Unveiling a two-dimensional electron gas with universal subbands at the surface of SrTiO3
• Creation and control of a two-dimensional electron liquid at the bare SrTiO3 surface
• Theory of spin-orbit coupling at LaAlO3/SrTiO3 interfaces and SrTiO3 surfaces
• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Two-dimensional superconductivity at a Mott-Insulator/Band-Insulator interface: LaTiO3/SrTiO3
• Two-dimensional quantum oscillations of the conductance at LaAlO3/SrTiO3 interfaces
• Subband structure of a two-dimensional electron gas formed at the polar surface of the strong spin-orbit perovskite KTaO${}_3$
• Built-in and induced polarization across LaAlO${}_3$/SrTiO${}_3$ heterojunctions
• Quasiparticle dynamics and spin-orbital texture of the SrTiO3 two-dimensional electron gas
• Shubnikov-de Haas oscillations in SrTiO3\LaAlO3 interface
• Band alignment at metal/ferroelectric interfaces: insights and artifacts from first principles
• First-principles modeling of electrostatically doped perovskite systems
• Polar catastrophe and electronic reconstructions at the LaAlO3/SrTiO3 interface: evidence from optical second harmonic generation
• Superconductivity at very low density: the case of strontium titanate
• Two-dimensional electron liquid state at LaAlO3-SrTiO3 interfaces
• Control of a two-dimensional electron gas on SrTiO3(111) by atomic oxygen
• Dynamical response and confinement of the electrons at the LaAlO3/SrTiO3 interface
• Rashba induced magnetoconductance oscillations in the LaAlO3-SrTiO3 heterostructure
• Multiple conducting carriers generated in LaAlO3/SrTiO3 heterostructures
• Observation of out-of-plane spin texture in a SrTiO3 (111) two-dimensional electron gas
• Anomalously large capacitance of a plane capacitor with a two-dimensional electron gas
• Ferroelectric Dead Layer Driven by a Polar Interface
• Band Structure and Spin-Orbital Texture of the (111)-KTaO3 Two-Dimensional Electron Gas
• Dual-Gate Modulation of Carrier Density and Disorder in an Oxide Two-Dimensional Electron System
• Strong evidence for d-electron spin transport at room temperature at a LaAlO3/SrTiO3 interface
• Gate-tunable band structure of the LaAlO${}_3$-SrTiO${}_3$ interface
• Large modulation of the Shubnikov-de Haas oscillations by the Rashba interaction at the LaAlO${}_3$/SrTiO${}_3$ interface
• Seebeck effect in the conducting LaAlO_{3}/SrTiO_{3} interface
• Phase diagrams of voltage-gated oxide interfaces with strong Rashba coupling
• Charge density distribution and optical response of the LaAlO3/SrTiO3 interface
• Absence of Giant Spin Splitting in the Two-Dimensional Electron Liquid at the Surface of SrTiO${}_3$ (001)
• Tuning up or down the critical thickness in LaAlO3/SrTiO3 through in situ deposition of metal overlayers
• Magneto-transport study of top- and back-gated LaAlO${}_3$/SrTiO${}_3$ heterostructures
• Modulation of the superconducting critical temperature due to quantum confinement at the LaAlO${}_3$/SrTiO${}_3$ interface
• Fabricating Superconducting Interfaces between Artificially-Grown LaAlO${}_3$ and SrTiO${}_3$ Thin Films
• Large band offset as driving force of 2-dimensional electron confinement: the case of SrTiO${}_3$/SrZrO${}_3$ interface
• Polar catastrophe, electron leakage, and magnetic ordering at the LaMnO${}_3$/SrMnO${}_3$ interface
• Evolution of the SrTiO${}_3$ surface electronic state as a function of LaAlO${}_3$ overlayer thickness
• Visualizing nanoscale electronic band alignment at the La${}_{2/3}$Ca${}_{1/3}$MnO${}_3$/Nb:SrTiO${}_3$ interface
• Anomalous response to gate voltage application in mesoscopic LaAlO_3/SrTiO_3 devices
• First-Principles Modeling of Pt/LaAlO3/SrTiO3 Capacitors Under an External Bias Potential
• Two-dimensional electron-gas-like charge transport at magnetic Heusler alloy-SrTiO${}_3$ interface
• The Conducting Channel at the LaAlO${}_3$/SrTiO${}_3$ Interface
• Two components for one resistivity in LaVO3/SrTiO3 heterostructures
• Carrier-number fluctuations in the 2-dimensional electron gas at the LaAlO3/SrTiO3 interface
• Anisotropic electronic transport of the two-dimensional electron system in Al2O3/SrTiO3 heterostructures
• Electronic Phases and Phase Separation in the Hubbard-Holstein Model of a Polar Interface
• Non-universal current flow near the metal-insulator transition in an oxide interface
• Plasmons at the LaAlO${}_3$/SrTiO${}_3$ interface and Graphene-LaAlO${}_3$/SrTiO${}_3$ double layer
• Bimodal Phase Diagram of the Superfluid Density in LaAlO3/SrTiO3 Revealed by an Interfacial Waveguide Resonator
• Influence of the ferroelectric quantum critical point on SrTiO${}_3$ interfaces
• Probing Quantum Confinement and Electronic Structure at Polar Oxide Interfaces
• Spin to charge conversion at Rashba-split SrTiO${}_3$ interfaces from resonant tunneling
• Superconducting tunneling spectroscopy of spin-orbit coupling and orbital depairing in Nb:SrTiO${}_3$
• Temperature-Dependent Band Structure of SrTiO${}_3$ Interfaces
• Electron mobility of a two-dimensional electron gas at the interface of SrTiO${}_3$ and LaAlO${}_3$
• Laterally-confined two-dimensional electron gases in self-patterned LaAlO3/SrTiO3 interfaces
• Electronic and magnetic properties in strongly correlated heterostructures
• A tool to estimate the critical dynamics and thickness of superconducting films and interfaces
• Magnetotransport and spin dynamics in an electron gas formed at oxide interfaces
• A Laser-ARPES View of the 2D Electron Systems at LaAlO3/SrTiO3 and Al/SrTiO3 Interfaces
• Unconventional quantum oscillations and evidence of nonparabolic electronic states in quasi-two-dimensional electron system at complex oxide interfaces
• Evolution of domain structure with electron doping in ferroelectric thin films
• BinPo: An open-source code to compute the band structure of two-dimensional electron systems
• Understanding the onset of negative electronic compressibility in one- and two-band 2D electron gases: Application to LaAlO${}_3$/SrTiO${}_3$
• Modified transverse Ising model for the dielectric properties of SrTiO${}_3$ films and interfaces
• Universally enhanced superconductivity and coexisting ferroelectricity at oxide interfaces
• A large modulation of electron-phonon coupling and an emergent superconducting dome in doped strong ferroelectrics