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

Bristowe, N. C. and Ghosez, Philippe and Littlewood, P. B. and Artacho, Emilio (2014) The origin of two-dimensional electron gases at oxide interfaces: insights from theory. Journal of Physics: Condensed Matter, 26 (14). pp. 143201-143221. ISSN 0953-8984. (doi:https://doi.org/10.1088/0953-8984/26/14/143201) (Full text available)

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http://dx.doi.org/10.1088/0953-8984/26/14/143201

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.

Item Type: Article
Uncontrolled keywords: oxide interfaces and surfaces; polar discontinuity; two-dimensional electron gas; lanthanum aluminate; strontium titanate; net charge; charge screening mechanisms
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QC Physics > QC176 Solid state physics
Q Science > QD Chemistry > QD478 Solid State Chemistry
Q Science > QC Physics > QC176.8.N35 Nanoscience, nanotechnology
Q Science > QD Chemistry > QD473 Physical properties in relation to structure
Divisions: Faculties > Sciences > School of Physical Sciences
Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Nicholas Bristowe
Date Deposited: 21 Feb 2017 16:15 UTC
Last Modified: 22 Feb 2017 16:19 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/60256 (The current URI for this page, for reference purposes)
Bristowe, N. C.: https://orcid.org/0000-0003-1286-8440
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