First-principles modeling of electrostatically doped perovskite systems

Abstract

Macroscopically, confined electron gases at polar oxide interfaces are rationalized within the simple "polar catastrophe" model. At the microscopic level, however, many other effects such as electric fields, structural distortions and quantum-mechanical interactions enter into play. Here we show how to bridge the gap between these two length scales, by combining the accuracy of first-principles methods with the conceptual simplicity of model Hamiltonian approaches. To demonstrate our strategy, we address the equilibrium distribution of the compensating free carriers at polar LaAlO3/SrTiO3 interfaces. Remarkably, a model including only calculated bulk properties of SrTiO3 and no adjustable parameters accurately reproduces our full first-principles results. Our strategy provides a unified description of charge compensation mechanisms in SrTiO3-based systems.

4 pages, 4 figures. Supplementary notes: http://www.icmab.es/dmmis/leem/stengel/supp.pdf

References in corpus (5)

• Unveiling a two-dimensional electron gas with universal subbands at the surface of SrTiO3
• Avoiding the polarization catastrophe in LaAlO3 overlayers on SrTiO3(001) through a polar distortion
• Tailoring a two-dimensional electron gas at the LaAlO3/SrTiO3 (001) interface by epitaxial strain
• Oxide superlattices with alternating p and n interfaces
• A First-Principles Study of the Electronic Reconstructions of LaAlO3/SrTiO3 Heterointerfaces and Their Variants

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