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LaAlO/SrTiO 界面的非化学计量比驱动载流子密度变化。

Off-Stoichiometry Driven Carrier Density Variation at the Interface of LaAlO/SrTiO.

机构信息

Institute of Physics, Academia Sinica, Nankang, Taipei, 11529, Taiwan.

Center for Condensed Matter Sciences, National Taiwan University, Taipei, 10617, Taiwan.

出版信息

Sci Rep. 2017 May 11;7(1):1770. doi: 10.1038/s41598-017-02039-x.

DOI:10.1038/s41598-017-02039-x
PMID:28496105
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5431992/
Abstract

The interface between LaAlO (LAO) and SrTiO (STO) has attracted enormous interests due to its rich physical phenomena, such as metallic nature, magnetism and superconductivity. In this work, we report our experimental investigations on the influence of the LAO stoichiometry to the metallic interface. Taking advantage of the oxide molecular beam epitaxy (MBE) technique, a series of high quality LAO films with different nominal La/Al ratios and LAO thicknesses were grown on the TiO-terminated STO substrates, where systematic variations of the LAO lattice constant and transport property were observed. In particular, the sheet density can be largely reduced by nearly an order of magnitude with merely about 20% increase in the nominal La/Al ratio. Our finding provides an effective method on tuning the electron density of the two-dimensional electron liquid (2DEL) at the LAO/STO interface.

摘要

LaAlO (LAO) 和 SrTiO (STO) 之间的界面因其丰富的物理现象而引起了极大的关注，例如金属性质、磁性和超导性。在这项工作中，我们报告了对 LAO 化学计量比对金属界面影响的实验研究。利用氧化物分子束外延 (MBE) 技术，在 TiO 终止的 STO 衬底上生长了一系列具有不同名义 La/Al 比和 LAO 厚度的高质量 LAO 薄膜，观察到 LAO 晶格常数和输运性质的系统变化。特别是，通过仅将名义 La/Al 比增加约 20%，就可以将薄片密度大大降低近一个数量级。我们的发现为在 LAO/STO 界面处调节二维电子液体 (2DEL) 的电子密度提供了一种有效方法。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f21b/5431992/3d0e13b4ea6a/41598_2017_2039_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f21b/5431992/3cd3d9af6996/41598_2017_2039_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f21b/5431992/bf52590c37bf/41598_2017_2039_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f21b/5431992/e42cacac9664/41598_2017_2039_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f21b/5431992/0ff825d0b647/41598_2017_2039_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f21b/5431992/3d0e13b4ea6a/41598_2017_2039_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f21b/5431992/3cd3d9af6996/41598_2017_2039_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f21b/5431992/bf52590c37bf/41598_2017_2039_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f21b/5431992/e42cacac9664/41598_2017_2039_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f21b/5431992/0ff825d0b647/41598_2017_2039_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f21b/5431992/3d0e13b4ea6a/41598_2017_2039_Fig5_HTML.jpg

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