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The origin of two-dimensional electron gases at oxide interfaces: insights from theory.

Accepted version
Peer-reviewed

Type

Article

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Authors

Bristowe, NC 
Ghosez, Philippe 
Littlewood, PB 

Abstract

The response of oxide thin films to polar discontinuities at interfaces and surfaces has generated enormous activity due to the variety of interesting effects that it gives rise to. A case in point is the discovery of the electron gas at the interface between LaAlO3 and SrTiO3, which has since been shown to be quasi-two-dimensional, switchable, magnetic and/or superconducting. Despite these findings, the origin of the two-dimensional electron gas is highly debated and several possible mechanisms remain. Here we review the main proposed mechanisms and attempt to model expected effects in a quantitative way with the ambition of better constraining what effects can/cannot explain the observed phenomenology. We do it in the framework of a phenomenological model constructed to provide an understanding of the electronic and/or redox screening of the chemical charge in oxide heterostructures. We also discuss the effect of intermixing, both conserving and not conserving the total stoichiometry.

Description

Keywords

Electric Conductivity, Electrons, Gases, Models, Chemical, Oxides, Quantum Theory

Journal Title

J Phys Condens Matter

Conference Name

Journal ISSN

0953-8984
1361-648X

Volume Title

26

Publisher

IOP Publishing