Dichotomy of the Photo Induced 2-Dimensional Electron Gas on SrTiO${}_3$ Surface Terminations

Abstract

Oxide materials are important candidates for the next generation of electronics due to a wide array of desired properties which they can exhibit alone or when combined with other materials. While SrTiO${}_3$ (STO) is often considered a prototypical oxide, it too hosts a wide array of unusual properties including a two dimensional electron gas (2DEG) which can form at the surface when exposed to UV light. Using layer-by-layer growth of high quality STO films, we show that the 2DEG only forms with the SrO termination and not with the TiO${}_2$ termination, contrary to expectation. This behavior is similarly seen in BaTiO${}_3$ (BTO), in which the 2DEG is only observed for BaO terminated films. These results will allow for a deeper understanding, and better control, of the electronic structure of titanate films, substrates and heterostructures.

arXiv comment19 pages, 3 figures

References in corpus (18)

• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface
• Coexistence of Magnetic Order and Two-dimensional Superconductivity at LaAlO${}_3$/SrTiO${}_3$ Interfaces
• Unveiling a two-dimensional electron gas with universal subbands at the surface of SrTiO3
• Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3
• Creation and control of a two-dimensional electron liquid at the bare SrTiO3 surface
• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3(110)
• Anisotropic two-dimensional electron gas at SrTiO3(110) protected by its native overlayer
• Atomically precise interfaces from non-stoichiometric deposition
• Control of a two-dimensional electron gas on SrTiO3(111) by atomic oxygen
• 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
• Localized versus itinerant states created by multiple oxygen vacancies in SrTiO3
• Mapping the Electronic Structure of Each Ingredient Oxide Layer of High-$T_{\text{c}}$ Cuprate Superconductor Bi2Sr2CaCu2O8+δ
• Absence of Giant Spin Splitting in the Two-Dimensional Electron Liquid at the Surface of SrTiO${}_3$ (001)
• Oxygen Vacancies on SrO-terminated SrTiO3(001) Surfaces studied by Scanning Tunneling Spectroscopy
• A survey of fractured SrTiO${}_3$ surfaces: from the micro-meter to nano-meter scale

Cited by in corpus (7)

• Universal Structural Influence on the 2D Electron Gas at SrTiO${}_3$ Surfaces
• Magic Doping and Robust Superconductivity in Monolayer FeSe on Titanates
• Single spin-polarised Fermi surface in SrTiO${}_3$ thin films
• 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
• Rashba splitting in polar-nonpolar sandwich heterostructure : A DFT Study
• Oxide MBE-ARPES at SSRL Beamline 5-2