Orbital Reconstruction and the Two-Dimensional Electron Gas at the LaAlO3/SrTiO3 Interface

被引：273

作者：

Salluzzo, M. ^{[1
]}

Cezar, J. C. ^{[2
]}

Brookes, N. B. ^{[2
]}

Bisogni, V. ^{[2
]}

De Luca, G. M. ^{[1
]}

Richter, C. ^{[3
]}

Thiel, S. ^{[3
]}

Mannhart, J. ^{[3
]}

Huijben, M. ^{[4
,5
]}

Brinkman, A. ^{[4
,5
]}

Rijnders, G. ^{[4
,5
]}

Ghiringhelli, G. ^{[6
,7
]}

机构：

[1] CNR, INFM, COHERNTIA, I-80126 Naples, Italy

[2] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[3] Univ Augsburg, Ctr Elect Correlat & Magnetism, D-86135 Augsburg, Germany

[4] Univ Twente, Fac Sci & Technol, NL-7500 AE Enschede, Netherlands

[5] Univ Twente, MESA Inst Nanotechnol, NL-7500 AE Enschede, Netherlands

[6] CNR, INFM, COHERNTIA, I-20133 Milan, Italy

[7] Politecn Milan, Dipartimento Fis, I-20133 Milan, Italy

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 16期

关键词：

X-RAY-ABSORPTION; OXIDE INTERFACES; HETEROSTRUCTURES; INSULATORS;

D O I：

10.1103/PhysRevLett.102.166804

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In 2004, Ohtomo and Hwang discovered that an electron gas is created at the interface between insulating LaAlO3 and SrTiO3 compounds. Here we show that the generation of a conducting electron gas is related to an orbital reconstruction occurring at the LaAlO3/SrTiO3 interface. Our results are based on extensive investigations of the electronic properties and of the orbital structure of the interface using x-ray absorption spectroscopy. In particular, we find that the degeneracy of the Ti 3d states is fully removed and that the Ti 3d(xy) levels become the first available states for conducting electrons.

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页数：4

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