Symmetry Lowering in Extreme-Electron-Density Perovskite Quantum Wells

被引：51

作者：

Zhang, Jack Y. ^{[1
]}

Hwang, Jinwoo ^{[1
]}

Raghavan, Santosh ^{[1
]}

Stemmer, Susanne ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 25期

关键词：

RECONSTRUCTION;

D O I：

10.1103/PhysRevLett.110.256401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on structural distortions in extreme-electron density (similar to 6 X 10(14) cm(-2)) confined quantum wells of SrTiO3 embedded in GdTiO3. Sr-column displacements are measured using high-angle annular dark- field imaging in scanning transmission electron microscopy. Using thick SrTiO3 layers as a reference, orthorhombic-like Sr-site displacements are observed when SrTiO3 quantum wells are thinner than 4 SrO layers, in precise agreement with an experimentally observed metal-to-insulator transition. It is shown that the structural displacements are absent in thicker quantum wells, even in the immediate proximity to the orthorhombic GdTiO3. The results are discussed in the context of strong electron correlations in this system.

引用

页数：5

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