Universal Structural Influence on the 2D Electron Gas at SrTiO${}_3$ Surfaces

Abstract

The two-dimensional electron gas found at the surface of SrTiO${}_3$ and related interfaces has attracted significant attention as a promising basis for oxide electronics. In order to utilize its full potential, the response of this 2DEG to structural changes and surface modification must be understood in detail. Here, we present a study of the detailed electronic structure evolution of the 2DEG as a function of sample temperature and surface step density. By comparing our experimental results with \textit{ab initio} calculations, we found that a SrO-rich surface layer is a prerequisite for electronic confinement. We also show that local structure relaxations cause a metal-insulator transition of the system around 135~K. Our study presents a new and simple way of tuning the 2DEG via surface vicinality and identifies how the operation of prospective devices will respond to changes in temperature.

References in corpus (24)

• Angle-resolved photoemission spectroscopy of the cuprate superconductors
• 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
• PyProcar: A Python library for electronic structure pre/post-processing
• Tunable polaronic conduction in anatase TiO2
• Effect of quantum fluctuations on structural phase transitions in SrTiO_3 and BaTiO_3
• Ab-initio study of SrTiO3 surfaces
• Universal Fabrication of Two-Dimensional Electron Systems in Functional Oxides
• Ab initio calculations of the atomic and electronic structure of CaTiO3 (001) and (011) surfaces
• Theory of the SrTiO3 Surface State Two-Dimensional Electron Gas
• Coexistence of trapped and free excess electrons in SrTiO3
• Mixed Dimensionality of Confined Conducting Electrons in the Surface Region of SrTiO${}_3$
• Localized electronic states induced by defects and possible origin of ferroelectricity in strontium titanate thin films
• Near-Surface Structural Phase Transition of SrTiO${}_3$ Studied with Zero-Field $\beta$-Detected Nuclear Spin Relaxation and Resonance
• Ab initio study of the two-dimensional metallic state at the surface of SrTiO3: importance of oxygen vacancies
• Localized versus itinerant states created by multiple oxygen vacancies in SrTiO3
• Electron dichotomy on the SrTiO${}_3$ defect surface augmented by many-body effects
• Does a pristine, unreconstructed SrTiO${}_3$(001) surface exist?
• Anisotropic electrical resistance in mesoscopic LaAlO${}_3$/SrTiO${}_3$ devices with individual domain walls
• Large polarons as key quasiparticles in SrTiO3 and SrTiO3-based heterostructures
• Depth Dependence of the Structural Phase Transition of SrTiO_3 Studied with β-NMR and Grazing Incidence X-ray Diffraction
• Dichotomy of the Photo Induced 2-Dimensional Electron Gas on SrTiO${}_3$ Surface Terminations
• Single spin-polarised Fermi surface in SrTiO${}_3$ thin films
• Structure and ferromagnetic instability of the oxygen-deficient SrTiO${}_3$ surface

Cited by in corpus (4)

• Duality and degeneracy lifting in two-dimensional electron liquids on SrTiO${}_3$(001)
• Direct evidence of a charge depletion region at the interface of Van der Waals monolayers and dielectric oxides: The case of superconducting FeSe/STO
• Two-Dimensional Charge Localization at the Perovskite Oxide Interface
• Orbital-resolved anisotropic electron pockets in electron-doped SrTiO3 observed by ARPES