Avoiding the Polarization Catastrophe in LaAlO3 Overlayers on SrTiO3(001) through Polar Distortion

被引：299

作者：

Pentcheva, Rossitza ^{[1
]}

Pickett, Warren E. ^{[2
]}

机构：

[1] Univ Munich, Dept Earth & Environm Sci, D-80333 Munich, Germany

[2] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 10期

关键词：

INTERFACES; FERROELECTRICITY; NANOSCALE;

D O I：

10.1103/PhysRevLett.102.107602

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A pronounced uniform polar distortion extending over several unit cells enables thin LaAlO3 overlayers on SrTiO3(001) to counteract the charge dipole and thereby neutralize the "polarization catastrophe" that is suggested by simple ion counting. This unanticipated mechanism, obtained from density functional theory calculations, allows several unit cells of the LaAlO3 overlayer to remain insulating (hence, fully ionic). The band gap of the system, defined by occupied O 2p states at the surface and unoccupied Ti 3d states at the interface in some cases similar to 20 A distant, decreases with increasing thickness of the LaAlO3 film before an insulator-to-metal transition and a crossover to an electronic reconstruction occurs at around five monolayers of LaAlO3.

引用

页数：4

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