Orientational tuning of the Fermi sea of confined electrons at the SrTiO3 (110) and (111) surfaces

Abstract

We report the existence of confined electronic states at the (110) and (111) surfaces of SrTiO3. Using angle-resolved photoemission spectroscopy, we find that the corresponding Fermi surfaces, subband masses, and orbital ordering are different from the ones at the (001) surface of SrTiO3. This occurs because the crystallographic symmetries of the surface and sub-surface planes, and the electron effective masses along the confinement direction, influence the symmetry of the electronic structure and the orbital ordering of the t2g manifold. Remarkably, our analysis of the data also reveals that the carrier concentration and thickness are similar for all three surface orientations, despite their different polarities. The orientational tuning of the microscopic properties of two-dimensional electron states at the surface of SrTiO3 echoes the tailoring of macroscopic (e.g. transport) properties reported recently in LaAlO3/SrTiO3 (110) and (111) interfaces, and is promising for searching new types of 2D electronic states in correlated-electron oxides.

arXiv commentAccepted for publication as a Letter in Physical Review Applied

References in corpus (13)

• Magnetic effects at the interface between nonmagnetic oxides
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• 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
• Interface engineering of quantum Hall effects in digital transition metal oxide heterostructures
• Subband structure of a two-dimensional electron gas formed at the polar surface of the strong spin-orbit perovskite KTaO${}_3$
• Topological insulators from complex orbital order in transition-metal oxides heterostructures
• High mobility conduction at (110) and (111) LaAlO3/SrTiO3 interfaces
• Possible interaction driven topological phases in (111) bilayers of LaNiO3
• Theory of the SrTiO3 Surface State Two-Dimensional Electron Gas
• Anisotropic two-dimensional electron gas at SrTiO3(110) protected by its native overlayer
• Unexpected Anisotropic Two Dimensional Electron Gas at the LaAlO3/SrTiO3 (110) Interface
• Massive symmetry breaking in LaAlO${}_3$/SrTiO${}_3$(111) quantum wells: a three-orbital, strongly correlated generalization of graphene

Cited by in corpus (39)

• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
• Universal Fabrication of Two-Dimensional Electron Systems in Functional Oxides
• 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
• Two-dimensional superconductivity at the (111)LaAlO${}_3$/SrTiO${}_3$ interface
• Six-fold crystalline anisotropic magnetoresistance in the (111) LaAlO${}_3$/SrTiO${}_3$ oxide interface
• Polar catastrophe in ultra-thin limit: A case of rare-earth perovskite LaNiO3
• Designing spin and orbital sources of Berry curvature at oxide interfaces
• Tunable superconductivity at the oxide-insulator/KTaO${}_3$ interface and its origin
• Hubbard band or oxygen vacancy states in the correlated electron metal SrVO${}_3$?
• Link between the Superconducting Dome and Spin-Orbit Interaction in the (111) LaAlO${}_3$/SrTiO${}_3$ Interface
• Engineering two-dimensional electron gases at the (001) and (101) surfaces of TiO2 anatase using light
• Topological states at the (001) surface of SrTiO3
• Atomically precise lateral modulation of a two-dimensional electron liquid in anatase TiO2 thin films
• Band inversion driven by electronic correlations at the (111) LaAlO${}_3$/SrTiO${}_3$ interface
• Two-dimensional electron system at the magnetically tunable EuO/SrTiO${}_3$ interface
• The quantum metric of electrons with spin-momentum locking
• Anisotropic, multi-carrier transport at the (111) LaAlO${}_3$/SrTiO${}_3$ interface
• Symmetry and correlation effects on band structure explain the anomalous transport properties of (111) LaAlO${}_3$/SrTiO${}_3$
• Symmetry breaking at the (111) interfaces of SrTiO${}_3$ hosting a 2D-electron system
• High-density two-dimensional electron system induced by oxygen vacancies in ZnO
• Magnetoresistance in the superconducting state at the (111) LaAlO${}_3$/SrTiO${}_3$ interface
• 2D surprises at the surface of 3D materials: confined electron systems in transition metal oxides
• 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
• Magnetic and nematic orders of the 2DEG at oxide (111) surfaces and interfaces
• Tunable two-dimensional electron system at the (110) surface of SnO${}_2$
• Polar compensation at the surface of SrTiO3 (111)
• Quantum interference effects of out-of-plane confinement on two-dimensional electron systems in oxides
• Strain-induced topological phase transition at (111) SrTiO${}_3$-based heterostructures
• $d_{xz/yz}$ Orbital Subband Structures and Chiral Orbital Angular Momentum in the (001) Surface States of SrTiO${}_3$
• Signatures of Electronic Nematicity in (111) LaAlO${}_3$/SrTiO${}_3$ Interfaces
• Anisotropic Magnetoresistance in Multiband Systems: 2DEGs and Polar Metals at Oxide Interfaces
• Electrostatic tuning of magnetism at the conducting (111) (La${}_{0.3}$Sr${}_{0.7}$)(Al${}_{0.65}$Ta${}_{0.35}$)/SrTiO${}_3$ interface
• Hard X-ray photoemission spectroscopy of LaVO${}_3$/SrTiO${}_3$: Band alignment and electronic reconstruction
• Low temperature magnetoresistance of (111) (La${}_{0.3}$Sr${}_{0.7}$)(Al${}_{0.65}$Ta${}_{0.35}$)/SrTiO${}_3$
• Epitaxial stabilization of an orthorhombic Mg-Ti-O superconductor
• Strong spin-orbit coupling and magnetism in (111) (La${}_{0.3}$Sr${}_{0.7}$)(Al${}_{0.65}$Ta${}_{0.35})$/SrTiO${}_3$