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arXiv 0905.0881cond-mat.mes-hallcond-mat.other
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具有交替p,n界面的氧化物超晶格

Oxide superlattices with alternating p and n interfaces

N. C. Bristowe, Emilio Artacho, P. B. Littlewood

摘要:

氧化物超晶格的物理被认为是原始的(001)多层带绝缘体LaAlO3和SrTiO3交替p和n界面。第一性原理的结果和电容器板的模型提供了一个简单的范例,以了解其介电性能和绝缘体的金属过渡(IMT)在界面层厚度增加。绝缘界面的电荷被发现是从正式的离子电荷,而不是人口预测。不同的相对层厚度产生系统的自发极化,并允许操纵界面电子气。大的压阻效应可以从IMT对横向应变的敏感性获得。载流子密度被发现是理想的激子凝聚。

英文摘要:

The physics of oxide superlattices is considered for pristine (001) multilayers of the band insulators LaAlO3 and SrTiO3 with alternating p and n interfaces. First principles results and a model of capacitor plates offer a simple paradigm to understand their dielectric properties and the insulator to metal transition (IMT) at interfaces with increasing layer thickness. The charge at insulating interfaces is 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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