Oxide superlattices with alternating p and n interfaces

被引：61

作者：

Bristowe, N. C. ^{[1
,2
]}

Artacho, Emilio ^{[2
]}

Littlewood, P. B. ^{[1
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Condensed Matter Theory Grp, Cambridge CB3 0HE, England

[2] Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

DENSITY-FUNCTIONAL THEORY; ELECTRON-GAS; HETEROSTRUCTURES;

D O I：

10.1103/PhysRevB.80.045425

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：5

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