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Oxide superlattices with alternating p and n interfaces

Bristowe, N. C., Artacho, Emilio, Littlewood, P. B. (2009) Oxide superlattices with alternating p and n interfaces. Physical Review B, 80 (4). 045425. ISSN 2469-9950. (doi:10.1103/PhysRevB.80.045425) (KAR id:60265)

Abstract

The physics of oxide superlattices is considered for pristine (001) multilayers of the band insulators LaAlO(3) and SrTiO(3) with alternating p and n interfaces. A model of charged capacitor plates offers a simple paradigm to understand their dielectric properties and the insulator to metal transition (IMT) at interfaces with increasing layer thicknesses. The model is supported by first-principles results based on density-functional theory. The charge at insulating interfaces is argued and found to be as predicted from the formal ionic charges, not populations. Different relative layer thicknesses produce a spontaneous polarization of the system, and allow manipulation of the interfacial electron gas. Large piezoresistance effects can be obtained from the sensitivity of the IMT to lateral strain. Carrier densities are found to be ideal for exciton condensation.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevB.80.045425
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: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: Nicholas Bristowe
Date Deposited: 21 Feb 2017 15:42 UTC
Last Modified: 16 Nov 2021 10:24 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/60265 (The current URI for this page, for reference purposes)

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