Quasiparticle dynamics and spin-orbital texture of the SrTiO3 two-dimensional electron gas

Abstract

Two-dimensional electron gases (2DEGs) in SrTiO${}_3$ have become model systems for engineering emergent behaviour in complex transition metal oxides. Understanding the collective interactions that enable this, however, has thus far proved elusive. Here we demonstrate that angle-resolved photoemission can directly image the quasiparticle dynamics of the $d$-electron subband ladder of this complex-oxide 2DEG. Combined with realistic tight-binding supercell calculations, we uncover how quantum confinement and inversion symmetry breaking collectively tune the delicate interplay of charge, spin, orbital, and lattice degrees of freedom in this system. We reveal how they lead to pronounced orbital ordering, mediate an orbitally-enhanced Rashba splitting with complex subband-dependent spin-orbital textures and markedly change the character of electron-phonon coupling, co-operatively shaping the low-energy electronic structure of the 2DEG. Our results allow for a unified understanding of spectroscopic and transport measurements across different classes of SrTiO${}_3$-based 2DEGs, and yield new microscopic insights on their functional properties.

10 pages including supplementary information, 4+4 figures

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Cited by in corpus (82)

• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
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• Direct observation of spin-polarised bulk bands in an inversion-symmetric semiconductor
• 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
• Maximal Rashba-like spin splitting via kinetic energy-driven inversion symmetry breaking
• Polaronic metal state at the LaAlO3/SrTiO3 interface
• Oxide spin-orbitronics: spin-charge interconversion and topological spin textures
• Universal Fabrication of Two-Dimensional Electron Systems in Functional Oxides
• Angle-resolved photoemission spectroscopy
• Topological superconductivity and unconventional pairing in oxide interfaces
• Control of a two-dimensional electron gas on SrTiO3(111) by atomic oxygen
• Observation of out-of-plane spin texture in a SrTiO3 (111) two-dimensional electron gas
• Revealing Hidden Orbital Pseudospin Texture with Time-Reversal Dichroism in Photoelectron Angular Distributions
• Surface magnetism of strontium titanate
• Magnetism, spin texture and in-gap states: Atomic specialization at the surface of oxygen-deficient SrTiO${}_3$
• Band Structure and Spin-Orbital Texture of the (111)-KTaO3 Two-Dimensional Electron Gas
• Determining the Rashba parameter from the bilinear magnetoresistance response in a two-dimensional electron gas
• Giant tunability of the two-dimensional electron gas at the interface of gamma-Al2O3/SrTiO3
• RKKY interaction in three-dimensional electron gases with linear spin-orbit coupling
• Observation of a cubic Rashba effect in the surface spin structure of rare-earth ternary materials
• Electrically Tunable Superconductivity Through Surface Orbital Polarization
• Spin responses and effective Hamiltonian for the two dimensional electron gas at oxide interface {LaAlO}${}_3$/{SrTiO}${}_3$
• Efficient intrinsic spin-to-charge current conversion in an all-epitaxial single-crystal perovskite-oxide heterostructure of La0.67Sr0.33MnO3/LaAlO3/SrTiO3
• Absence of Giant Spin Splitting in the Two-Dimensional Electron Liquid at the Surface of SrTiO${}_3$ (001)
• Nature of Orbital and Spin Rashba Coupling in the Surface Bands of SrTiO3 and KTaO3
• Origin of the anomalous mass renormalization in metallic quantum well states of correlated oxide SrVO${}_3$
• Giant switchable Rashba effect in oxide heterostructures
• Non-monotonic anisotropy in charge conduction induced by antiferrodistortive transition in metallic SrTiO${}_3$
• Atomically precise lateral modulation of a two-dimensional electron liquid in anatase TiO2 thin films
• Selective control of localised vs. delocalised carriers in anatase TiO2 through reaction with O2
• Electron dichotomy on the SrTiO${}_3$ defect surface augmented by many-body effects
• Electron degeneracy and intrinsic magnetic properties of epitaxial Nb:SrTiO${}_3$ thin-films controlled by defects
• Does a pristine, unreconstructed SrTiO${}_3$(001) surface exist?
• Observation of Nonlinear Spin-Charge Conversion in the Thin Film of Nominally Centrosymmetric Dirac Semimetal SrIrO3 at Room Temperature
• Quasiparticle interference on cubic perovskite oxide surfaces
• Band-Order Anomaly at the γ-Al2O3/SrTiO3 Interface Drives the Electron-Mobility Boost
• Spin-texture induced by oxygen vacancies in Strontium perovskites (001) surfaces: A theoretical comparison between SrTiO3 and SrHfO3
• Tuning Rashba spin-orbit coupling at LaAlO3/SrTiO3 interfaces by band filling
• High-density two-dimensional electron system induced by oxygen vacancies in ZnO
• 2D surprises at the surface of 3D materials: confined electron systems in transition metal oxides
• Formation and observation of a quasi-two-dimensional $d_{xy}$ electron liquid in epitaxially stabilized Sr${}_{2-x}$La${}_x$TiO${}_4$ thin films
• Semiclassical theory of anisotropic transport at LaAlO3/SrTiO3 interfaces under in-plane magnetic field
• Signature of enhanced spin-orbit interaction in the magnetoresistance of LaTiO${}_3$/SrTiO${}_3$ interfaces on $\delta$-doping
• Anisotropic Electronic Structure of the Two-Dimensional Electron Gas at the AlOx/KTaO3(110) interface
• Electron trapping and detrapping in an oxide two-dimensional electron gas: The role of ferroelastic twin walls
• From Weak Antilocalization to Kondo Scattering in a Magnetic Complex Oxide Interface
• Theoretical models of Rashba spin splitting in asymmetric SrTiO3-based heterostructures
• Tunable Rashba spin-orbit coupling and its interplay with multiorbital effect and magnetic ordering at oxide interfaces
• Quasiparticle Mass Enhancement and Fermi Surface Shape Modification in Oxide Two-Dimensional Electron Gases
• Spin-Orbital Hallmarks of Unconventional Superconductors Without Inversion Symmetry
• Coherent Modulation of Quasiparticle Scattering Rates in a Photoexcited Charge-Density-Wave System
• Controlling spin Hall effect by using a band anticrossing and nonmagnetic impurity scattering
• Superconducting tunneling spectroscopy of spin-orbit coupling and orbital depairing in Nb:SrTiO${}_3$
• Spin to charge conversion at Rashba-split SrTiO${}_3$ interfaces from resonant tunneling
• Quantum interference effects of out-of-plane confinement on two-dimensional electron systems in oxides
• Strain Engineering of the Intrinsic Spin Hall Conductivity in a SrTiO${}_3$ Quantum Well
• Single spin-polarised Fermi surface in SrTiO${}_3$ thin films
• $d_{xz/yz}$ Orbital Subband Structures and Chiral Orbital Angular Momentum in the (001) Surface States of SrTiO${}_3$
• Kondo effect with tunable spin orbit interaction in LaTiO3/CeTiO3/SrTiO3 heterostructure
• Effects of spin-orbit interaction and electron correlations in strontium titanate
• Soft x-ray irradiation induced metallization of layered TiNCl
• Spin texture driven spintronic enhancement at the LaAlO${}_3$/SrTiO${}_3$ interface
• A Laser-ARPES View of the 2D Electron Systems at LaAlO3/SrTiO3 and Al/SrTiO3 Interfaces
• Effect of confinement and Coulomb interactions on the electronic structure of (111) LaAlO${}_3$/SrTiO${}_3$ interface
• High stability 2D electron gases formed in Si3N4/Al//KTaO3 heterostructures: synthesis and in-depth interfacial characterization
• Multi-orbital Fulde-Ferrell-Larkin-Ovchinnikov State in SrTiO_3 Heterostructures
• Optical conductivity of a 2DEG with anisotropic Rashba interaction at the interface of LaAlO${}_3$/SrTiO${}_3$
• Spin Berry points as crucial for ultrafast demagnetization
• Theoretical analysis of the inverse Edelstein effect at the LaAlO${}_3$ / SrTiO${}_3$ interface with an effective tight-binding model: Important role of the second $d_{xy}$ subband
• Duality and degeneracy lifting in two-dimensional electron liquids on SrTiO${}_3$(001)
• Current-induced spin polarisation in Rashba-Dresselhaus systems under different point groups
• Effects of paramagnetic pair-breaking and spin-orbital coupling on multi-band superconductivity
• Evidence of linear and cubic Rashba effect in non-magnetic heterostructure
• Pair-breaking of multi-gap superconductivity under parallel magnetic fields in electric-field-induced surface metallic state
• Sign-changing non-monotonic voltage gain of HfO2/Parylene-C/SrTiO3 field-effect transistor due to percolative insulator to two-dimensional metal transition
• Spin-Hall Current and Nonlocal Transport in Ferromagnet-Free Multi-band models for SrTiO3-Based Nanodevices in the presence of impurities
• Many-body calculations of plasmon and phonon satellites in angle-resolved photoelectron spectra using the cumulant expansion approach
• THz carrier dynamics in $SrTi{O}_3/LaTi{O}_3$ interface two-dimensional electron gases
• Three-dimensionality of mobile electrons at X-ray-irradiated LaAlO${}_3$/SrTiO${}_3$ interfaces
• KTaO3(001) Preparation Methods in Vacuum: Effects on Surface Stoichiometry, Crystallography, and in-gap States
• Spinor ice correlation in flat-band electronic states on kagome and pyrochlore lattices with spin-orbit coupling