First principles study of transport properties of LaAlO3/SrTiO3 heterostructure with water adsorbates

被引：2
|
作者：
Lo, W. C. [1 ]
Au, Kit [1 ]
Chan, N. Y. [1 ]
Huang, Haitao [1 ]
Lam, Chi-Hang [1 ]
Dai, J. Y. [1 ]
机构：
[1] Hong Kong Polytech Univ, Dept Appl Phys, Shenzhen Res Inst, Kowloon, Hong Kong, Peoples R China
来源：
SOLID STATE COMMUNICATIONS | 2013年 / 169卷
关键词：
LaAlO3/SrTiO3; Interface; Polar molecule sensor; Two-dimensional electron gas; TOTAL-ENERGY CALCULATIONS; OXIDE HETEROINTERFACE; ELECTRON-GAS; 001; SURFACE; INTERFACES; ADSORPTION;
D O I：
10.1016/j.ssc.2013.07.006
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Tuning transport properties of two-dimensional electron gas (2DEG) at the LaAlO3/SrTiO3 interface by surface modification is of great interest due to its rich physics and potential application in polar liquid or gas sensors. From first-principle calculations, we found that the adsorption of a thin layer of polar water molecules on the surface of LaAlO3 can remarkably enhance the carrier density of the interfacial 2DEG by over at least 50% which is qualitatively consistent with reported experimental result. This result sheds light on the charge coupling between surface polar molecules and interfacial 2DEG and suggests that sensor devices may be built using the hetero-oxide interfacial 2DEG. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：46 / 49
页数：4
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