Anisotropic two-dimensional electron gas at SrTiO3(110) protected by its native overlayer

Abstract

Two dimensional electron gases (2DEGs) at a oxide heterostructures are attracting considerable attention, as these might substitute conventional semiconductors for novel electronic devices [1]. Here we present a minimal set-up for such a 2DEG -the SrTiO3(110)-(4 x 1) surface, natively terminated with one monolayer of chemically-inert titania. Oxygen vacancies induced by synchrotron radiation migrate under- neath this overlayer, this leads to a confining potential and electron doping such that a 2DEG develops. Our angular resolved photoemission spectroscopy (ARPES) and theoretical results show that confinement along (110) is strikingly different from a (001) crystal orientation. In particular the quantized subbands show a surprising "semi-heavy" band, in contrast to the analogue in the bulk, and a high electronic anisotropy. This anisotropy and even the effective mass of the (110) 2DEG is tunable by doping, offering a high flexibility to engineer the properties of this system.

References in corpus (3)

• Magnetic effects at the interface between nonmagnetic oxides
• Water Adsorption at the Tetrahedral Titania Surface Layer of SrTiO${}_3$(110)-(4$\times$1)
• Strain-induced Defect Superstructure on the SrTiO3(110) Surface

Cited by in corpus (51)

• Iron Oxide Surfaces
• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
• Tailoring the nature and strength of electron-phonon interactions in the SrTiO${}_3$(001) two-dimensional electron liquid
• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3(110)
• Control of a two-dimensional electron gas on SrTiO3(111) by atomic oxygen
• Coexistence of trapped and free excess electrons in SrTiO3
• Electronics with correlated oxides: SrVO${}_3$/SrTiO${}_3$ as a Mott transistor
• Ubiquitous strong electron phonon coupling at the interface of FeSe/SrTiO3
• Orientational tuning of the Fermi sea of confined electrons at the SrTiO3 (110) and (111) surfaces
• Quantum-Matter Heterostructures
• Surface magnetism of strontium titanate
• Interface high-temperature superconductivity
• Engineering two-dimensional electron gases at the (001) and (101) surfaces of TiO2 anatase using light
• Localized versus itinerant states created by multiple oxygen vacancies in SrTiO3
• Gate Tunable In- and Out-Of-Plane Spin-Orbit Coupling and Spin Splitting Anisotropy at LaAlO3/SrTiO3 (110) Interface
• Transition from reconstruction towards thin film on the (110) surface of strontium titanate
• Incipient ferroelectricity: A route towards bulk-terminated SrTiO3
• Anisotropic effects in two-dimensional materials
• Spontaneous rotational symmetry breaking in KTaO${}_3$ heterointerface superconductors
• Atomically precise lateral modulation of a two-dimensional electron liquid in anatase TiO2 thin films
• Mechanism, time-reversal symmetry and topology of superconductivity in noncentrosymmetric systems
• Symmetry breaking at the (111) interfaces of SrTiO${}_3$ hosting a 2D-electron system
• Vacancy clusters at domain boundaries and band bending at the SrTiO${}_3$(110) surface
• Tunable two-dimensional electron gas at the surface of thermoelectric material In${}_4$Se${}_3$
• Imaging ambipolar two-dimensional carriers induced by the spontaneous electric polarization of a polar semiconductor BiTeI
• 2D surprises at the surface of 3D materials: confined electron systems in transition metal oxides
• Stabilizing Single Ni adatoms on a Two-dimensional Porous Titania Overlayer at the SrTiO${}_3$(110) Surface
• Two-dimensional electron systems in ATiO3 perovskites (A = Ca, Ba, Sr): control of orbital hybridization and order
• Dichotomy of the Photo Induced 2-Dimensional Electron Gas on SrTiO${}_3$ Surface Terminations
• Anisotropic Electronic Structure of the Two-Dimensional Electron Gas at the AlOx/KTaO3(110) interface
• Tunable two-dimensional electron system at the (110) surface of SnO${}_2$
• Excitations in a spin-polarized tow-dimensional electron gas
• 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
• Tunable spin and orbital polarization in SrTiO3-based heterostructures
• Hubbard models with nearly flat bands: Ground-state ferromagnetism driven by kinetic energy
• Controlled confinement of half-metallic two-dimensional electron gas in BaTiO3/Ba2FeReO6/BaTiO3 heterostructures: A first-principles study
• Superconductivity at epitaxial LaTiO3-KTaO3 interfaces
• Quantum interference effects of out-of-plane confinement on two-dimensional electron systems in oxides
• Electron microscopy and spectroscopic study of structural changes, electronic properties and conductivity in annealed Li${}_x$CoO${}_2$
• Reconciling the theoretical and experimental electronic structure of NbO2
• Anisotropy of the infrared-active phonon modes in the mono-domain state of tetragonal SrTiO3 (110)
• Emergent flat band lattices in spatially periodic magnetic fields
• A Laser-ARPES View of the 2D Electron Systems at LaAlO3/SrTiO3 and Al/SrTiO3 Interfaces
• Magnetic and Electronic Properties of Spin-Orbit Coupled Dirac Electrons on a $(001)$ Thin Film of Double Perovskite Sr${}_2$FeMoO${}_6$
• Hard X-ray photoemission spectroscopy of LaVO${}_3$/SrTiO${}_3$: Band alignment and electronic reconstruction
• Duality and degeneracy lifting in two-dimensional electron liquids on SrTiO${}_3$(001)
• Anisotropic electronic transport and Rashba effect of the two-dimensional electron system in (110) SrTiO${}_3$-based heterostructures
• Orbital-resolved anisotropic electron pockets in electron-doped SrTiO3 observed by ARPES
• Competing electronic states emerging on polar surfaces
• Superfluid response of two-dimensional filamentary superconductors
• Scanning gate microscopy probing of anisotropic electron flow in a two dimensional electron gas at the (110) ${\mathrm{LaAlO}}_3/{\mathrm{SrTiO}}_3$ interface: A theoretical investigation