Oxide superlattices with alternating p and n interfaces

Bristowe, N. C. and Artacho, E. and Littlewood, P. B. (2009) Oxide superlattices with alternating p and n interfaces. Physical Review B (Condensed Matter and Materials Physics), 80 (4). 045425-5. DOI 10.1103/PhysRevB.80.045425

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Abstract

The physics of oxide superlattices is considered for pristine (001) multilayers of the band insulators LaAlO3 and SrTiO3 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
Uncontrolled Keywords: 09AREP; IA58;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Physical Review B (Condensed Matter and Materials Physics)
Volume: 80
Page Range: 045425-5
Identification Number: 10.1103/PhysRevB.80.045425
Depositing User: Sarah Humbert
Date Deposited: 10 Sep 2009 08:03
Last Modified: 23 Jul 2013 09:55
URI: http://eprints.esc.cam.ac.uk/id/eprint/1173

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