Origin of the Two-Dimensional Electron Gas Carrier Density at the LaAlO3 on SrTiO3 Interface

被引：375

作者：

Popovic, Zoran S. ^{[1
,2
]}

Satpathy, Sashi ^{[1
,3
]}

Martin, Richard M. ^{[1
]}

机构：

[1] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[2] INN Vinca, Belgrade, Serbia

[3] Univ Missouri, Dept Phys, Columbia, MO 65211 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 25期

关键词：

D O I：

10.1103/PhysRevLett.101.256801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Transport measurements of the two-dimensional electron gas at the LaAlO3-SrTiO3 interface have found a density of carriers much lower than expected from the "polar catastrophe" arguments. From a detail density-functional study, we suggest how this discrepancy may be reconciled. We find that electrons occupy multiple subbands at the interface leading to a rich array of transport properties. Some electrons are confined to a single interfacial layer and susceptible to localization, while others with small masses and extended over several layers are expected to contribute to transport.

引用

页数：4

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