Observation of a two-dimensional electron gas at CaTiO${}_3$ film surfaces

Abstract

The two-dimensional electron gas at the surface of titanates gathered attention due to its potential to replace conventional silicon based semiconductors in the future. In this study, we investigated films of the parent perovskite CaTiO${}_3$, grown by pulsed laser deposition, by means of angular-resolved photoelectron spectroscopy. The films show a c(4x2) surface reconstruction after the growth that is reduced to a p(2x2) reconstruction under UV-light. At the CaTiO${}_3$ film surface, a two-dimensional electron gas (2DEG) is found with an occupied band width of 400 meV. With our findings CaTiO${}_3$ is added to the group of oxides with a 2DEG at their surface. Our study widens the phase space to investigate strontium and barium doped CaTiO${}_3$ and the interplay of ferroelectric properties with the 2DEG at oxide surfaces. This could open up new paths to tailor two-dimensional transport properties of these systems towards possible applications.

References in corpus (16)

• Magnetic effects at the interface between nonmagnetic oxides
• 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
• Tunable polaronic conduction in anatase TiO2
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• Tailoring the nature and strength of electron-phonon interactions in the SrTiO${}_3$(001) two-dimensional electron liquid
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• Conducting interfaces between band insulating oxides: the LaGaO3/SrTiO3
• Universal Substrate Effect on the Superconductivity of FeSe Monolayer Films
• Mixed Dimensionality of Confined Conducting Electrons in the Surface Region of SrTiO${}_3$
• Determination of the orbital moment and crystal field splitting in LaTiO${}_3$
• Persistent photoconductivity in 2-dimensional electron gases at different oxide interfaces
• Ferromagnetism in itinerant two-dimensional t2g systems
• Atomically precise lateral modulation of a two-dimensional electron liquid in anatase TiO2 thin films
• Atomically Resolved Surface Structure of SrTiO3(001) Thin Films Grown in Step-Flow Mode by Pulsed Laser Deposition

Cited by in corpus (6)

• Two-dimensional electron systems in ATiO3 perovskites (A = Ca, Ba, Sr): control of orbital hybridization and order
• Anisotropic Electronic Structure of the Two-Dimensional Electron Gas at the AlOx/KTaO3(110) interface
• Observation of Wannier-Stark localization at the surface of BaTiO${}_3$ films by photoemission
• On the Origin of the Two-Dimensional Electron Gas at the CdO (100) Surface
• Metallic interfaces in a CaTiO${}_3$/LaTiO${}_3$ heterostructure
• A two-dimensional electron gas at the (001) surface of ferromagnetic EuTiO${}_3$(001)