Polaronic metal state at the LaAlO3/SrTiO3 interface

Abstract

Interplay of spin, charge, orbital and lattice degrees of freedom in oxide heterostructures results in a plethora of fascinating properties, which can be exploited in new generations of electronic devices with enhanced functionalities. The paradigm example is the interface between the two band insulators LaAlO3 and SrTiO3 (LAO/STO) that hosts two-dimensional electron system (2DES). Apart from the mobile charge carriers, this system exhibits a range of intriguing properties such as field effect, superconductivity and ferromagnetism, whose fundamental origins are still debated. Here, we use soft-X-ray angle-resolved photoelectron spectroscopy to penetrate through the LAO overlayer and access charge carriers at the buried interface. The experimental spectral function directly identifies the interface charge carriers as large polarons, emerging from coupling of charge and lattice degrees of freedom, and involving two phonons of different energy and thermal activity. This phenomenon fundamentally limits the carrier mobility and explains its puzzling drop at high temperatures.

References in corpus (10)

• A high-mobility two-dimensional electron gas at the heteroepitaxial spinel/perovskite complex oxide interface of γ-Al2O3/SrTiO3
• Tailoring the nature and strength of electron-phonon interactions in the SrTiO${}_3$(001) two-dimensional electron liquid
• Electron-phonon interaction and charge carrier mass enhancement in SrTiO3
• Origin of the large phonon band-gap in SrTiO3 and the vibrational signatures of ferroelectricity in ATiO3 perovskite: First principles lattice dynamics and inelastic neutron scattering of PbTiO3, BaTiO3 and SrTiO3
• Structure and Correlation Effects in Semiconducting SrTiO${}_3$
• Diagrammatic Monte Carlo method for many-polaron problems
• Polaron Coherence Condensation as the Mechanism for Colossal Magnetoresistance in Layered Manganites
• Giant Oscillating Thermopower at Oxide Interfaces
• Large modulation of the Shubnikov-de Haas oscillations by the Rashba interaction at the LaAlO${}_3$/SrTiO${}_3$ interface
• Electron-phonon Coupling and the Superconducting Phase Diagram of the LaAlO3-SrTiO3 Interface

Cited by in corpus (72)

• Electron-phonon interactions from first principles
• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Tailoring the nature and strength of electron-phonon interactions in the SrTiO${}_3$(001) two-dimensional electron liquid
• Origin of the crossover from polarons to Fermi liquids in transition metal oxides
• Ab initio theory of polarons: formalism and applications
• Polarons from first principles, without supercells
• Angle-resolved photoemission spectroscopy
• Phonon driven Floquet matter
• Carrier Lifetimes and Polaronic Mass Enhancement in the Hybrid Halide Perovskite CH${}_3$NH${}_3$PbI${}_3$ from Multiphonon Fröhlich Coupling
• Spin and orbital Edelstein effect in an oxide two-dimensional electron gas: theory and application to AlO${}_x$/SrTiO${}_3$
• Floquet analysis of excitations in materials
• Quasiparticles and phonon satellites in spectral functions of semiconductors and insulators: Cumulants applied to full first principles theory and Fröhlich polaron
• Predicting charge transport in the presence of polarons: The beyond-quasiparticle regime in SrTiO${}_3$
• Observation of the polaronic character of excitons in a two-dimensional semiconducting magnet $\mathrm{Cr}{\mathrm{I}}_3$
• Polarons in two-dimensional atomic crystals
• k-Space imaging of anisotropic 2D electron gas in GaN/GaAlN high-electron-mobility transistor heterostructures
• Unified approach to polarons and phonon-induced band structure renormalization
• Ab initio self-consistent many-body theory of polarons at all couplings
• Microscopic origin of the mobility enhancement at a spinel/perovskite oxide heterointerface revealed by photoemission spectroscopy
• Ultrafast relaxation dynamics of the antiferrodistortive phase in Ca doped SrTiO3
• Orientation-dependent electron-phonon coupling in interfacial superconductors LaAlO3/KTaO3
• Band-Order Anomaly at the γ-Al2O3/SrTiO3 Interface Drives the Electron-Mobility Boost
• Large polarons as key quasiparticles in SrTiO3 and SrTiO3-based heterostructures
• Electron-polaron dichotomy of charge carriers in perovskite oxides
• Tuneable electron-magnon coupling of ferromagnetic surface states in PdCoO${}_2$
• Metal-Insulator Transition and Emergent Gapped Phase in the Surface-Doped 2D Semiconductor 2H-MoTe${}_2$
• Superconducting properties of a nonideal bipolaron gas
• 2D surprises at the surface of 3D materials: confined electron systems in transition metal oxides
• Momentum-resolved electronic band structure and offsets in an epitaxial NbN/GaN superconductor/semiconductor heterojunction
• Raman and fluorescence contributions to resonant inelastic soft x-ray scattering on LaAlO${}_3$/SrTiO${}_3$ heterostructures
• Capacitance and compressibility of heterostructures with strong electronic correlations
• Tuning two-dimensional electron (hole) gases at LaInO${}_3$/BaSnO${}_3$ interfaces: Impact of polar distortions, termination, and thickness
• Identification of large polarons and exciton polarons in rutile and anatase polymorphs of titanium dioxide
• Real-Space Visualization of Frequency-Dependent Anisotropy of Atomic Vibrations
• Plasmons at the LaAlO${}_3$/SrTiO${}_3$ interface and Graphene-LaAlO${}_3$/SrTiO${}_3$ double layer
• Probing Quantum Confinement and Electronic Structure at Polar Oxide Interfaces
• Large phonon-drag enhancement induced by narrow quantum confinement at the LaAlO3/SrTiO3 interface
• Interplay between singlet and triplet pairings in multi-band two-dimensional oxide superconductors
• Dynamic Modulation of the Transport Properties of the LaAlO3/SrTiO3 Interface Using Uniaxial Strain
• Effect of a skin-deep surface zone on formation of two-dimensional electron gas at a semiconductor surface
• Giant Grüneisen parameter in a strain-tuned superconducting quantum paraelectric: A consequence of the vanishing ferroelectric phonon energy
• Temperature-Dependent Band Structure of SrTiO${}_3$ Interfaces
• Anomalous transport near the Lifshitz transition at the LaAlO${}_3$/SrTiO${}_3$ interface
• Two-dimensional electron systems in perovskite oxide heterostructures: Role of the polarity-induced substitutional defects
• Manifestations of the electron-phonon interaction range in angle resolved photoemission spectra
• Enhancement of electron mobility at oxide interfaces induced by WO3 overlayers
• Artificial quantum confinement in LAO3/STO heterostructure
• Ultrafast Modification of the Polarity at LaAlO${}_3$/SrTiO${}_3$ Interfaces
• Nonperturbative self-consistent electron-phonon spectral functions and transport
• Domes of $T_c$ in single-band and multiband superconductors with finite-range attractive interactions
• A Laser-ARPES View of the 2D Electron Systems at LaAlO3/SrTiO3 and Al/SrTiO3 Interfaces
• Ground state features and spectral properties of large polaron liquids from low to high charge densities
• Quantum oscillations in an optically-illuminated two-dimensional electron system at the LaAlO${}_3$/SrTiO${}_3$ interface
• Enhanced tunability of two-dimensional electron gas on SrTiO3 through heterostructuring
• Direct observation of two-dimensional small polarons at correlated oxide interface
• Duality and degeneracy lifting in two-dimensional electron liquids on SrTiO${}_3$(001)
• Importance of coupling strength in shaping electron energy loss and phonon spectra of phonon-plasmon systems
• Small polarons mediated near-room-temperature metal-insulator transition in vanadium dioxide and their hopping dynamics
• Many-body calculations of plasmon and phonon satellites in angle-resolved photoelectron spectra using the cumulant expansion approach
• Spectral function of a bipolaron coupled to dispersive optical phonons
• Dichotomy of electron-phonon interactions in the delafossite PdCoO${}_2$: From weak bulk to polaronic surface coupling
• Effects of Homogeneous Doping on Electron-Phonon Coupling in SrTiO3
• Beyond-quasiparticle transport with vertex correction: self-consistent ladder formalism for electron-phonon interactions
• Competing electronic states emerging on polar surfaces
• Coupled First-Order Transitions In A Fermi-Bose Mixture
• Three-dimensionality of mobile electrons at X-ray-irradiated LaAlO${}_3$/SrTiO${}_3$ interfaces
• Probing the polar-nonpolar oxide interfaces using resonant x-ray standing wave techniques
• Quantized conductance in a one-dimensional ballistic oxide nanodevice
• Many-body Green's function approaches to the doped Fröhlich solid: Exact solutions and anomalous mass enhancement
• Extremely low energy ARPES of quantum well states in cubic-GaN/AlN and GaAs/GaAlAs heterostructures
• Band-selective Holstein polaron in Luttinger liquid material A0.3MoO3 (A = K, Rb)