Surface Effects on Oxide Heterostructures

Abstract

We report on surface effects on the electronic properties of interfaces in epitaxial LaAlO${}_3$/SrTiO${}_3$ heterostructures. Our results are based on first-principles electronic structure calculations for well-relaxed multilayer configurations, terminated by an ultrathin LaAlO${}_3$ surface layer. On varying the thickness of this layer, we find that the interface conduction states are subject to almost rigid band shifts due to a modified Fermi energy. Confirming experimental data, the electronic properties of heterointerfaces therefore can be tuned systematically by alterating the surface-interface distance. We expect that this mechanism is very general and applies to most oxide heterostructures.

10 pages, 3 figures, accepted by Europhys. Lett

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Cited by in corpus (20)

• Avoiding the polarization catastrophe in LaAlO3 overlayers on SrTiO3(001) through a polar distortion
• "Water-cycle" mechanism for writing and erasing nanostructures at the LaAlO3/SrTiO3 interface
• Control of electronic conduction at an oxide heterointerface using surface polar adsorbates
• Experimental study of the interfacial cobalt oxide in Co3O4/a-Al2O3(0001) epitaxial films
• Two-dimensional electron liquid state at LaAlO3-SrTiO3 interfaces
• Fundamental asymmetry in interfacial electronic reconstruction between insulating oxides
• Interface relaxation and electrostatic charge depletion in the oxide heterostructure LaAlO3/SrTiO3
• Interface and electronic characterization of thin epitaxial Co3O4 films
• Exponential decay of relaxation effects at LaAlO3/SrTiO3 heterointerfaces
• Metal-insulator transition at the LaAlO3/SrTiO3 interface revisited: A hybrid functional study
• Structural relaxation and metal-insulator transition at the interface between SrTiO3 and LaAlO3
• Charge and orbital order in transition metal oxides
• Stripe segregation and magnetic coupling in the nickelate La_5/3 Sr_1/3 NiO_4
• Interface energies of (100)_{YSZ} and (111)_{YSZ} epitaxial islands on (0001)_{alpha-Al_2O_3} substrates from first principles
• Quantitative calculations of charge carrier densities in the depletion layers at YBa2Cu3O7-x interfaces
• Geometry dependence of the charge transfer at YBa2Cu3O7-metal interfaces
• Quantum size effects in Pb layers with absorbed Kondo adatoms: Determination of the exchange coupling constant
• Electronic transport calculations for rough interfaces in Al, Cu, Ag, and Au
• Influence of the vacuum interface on the charge distribution in V2O3 thin films
• Stripe Phases in Layered Nickelates