Fabrication of Conductive Quantum Wire by using Dislocation Array

利用位错阵列制造导电量子线

• 批准号: 23560817
• 负责人: SAITO Mitsuhiro
• 金额: $ 3.41万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23560817/
• 关键词: 量子細線; 電子顕微鏡; 転位; 結晶界面; 粒界; 界面

In this work, a conductive quantum wire was fabricated by using high-temperature segregation behavior of a metallic dopant along a dislocation core in an insulating MgO bicrystal grain boundary (GB) and then was characterized by a scanning TEM (STEM) and a first-principle calculation. The STEM image and electron energy loss spectrum (EELS) mapping showed that a structure unit in the MgO GB is formed to compensate lattice mismatch and calcium (Ca) and titanium (Ti) impurities are strongly localized in the GB. The first-principle calculation revealed that the segregated Ti atoms form conductive channels along the GB suggesting semi-conductor like behavior. By using self-segregation behavior along a dislocation core, we demonstrated to fabricate a low dimensional quantum structure with a specific electronic property in an insulating solid crystal.

本文利用金属掺杂在绝缘MgO双晶晶界（GB）中沿位错核的高温偏析行为制备了导电量子线，并用扫描透射电镜（STEM）和第一性原理计算对其进行了表征。STEM图像和电子能量损失谱（EELS）映射表明，在MgO GB中形成了一个结构单元来补偿晶格失配，钙（Ca）和钛（Ti）杂质在GB中强烈定位。第一性原理计算表明，分离的Ti原子沿着GB形成导电通道，显示出类似半导体的行为。通过利用位错核的自偏析行为，我们证明了在绝缘固体晶体中制造具有特定电子特性的低维量子结构。

项目成果

Selective impurity segregation at a near-Σ5 grain boundary in MgO

• DOI: 10.1007/s10853-014-8016-7
• 发表时间: 2014-01
• 期刊: Journal of Materials Science
• 影响因子: 4.5
• 作者: M. Saito;Zhongchang Wang;Y. Ikuhara

Atom-Resolved Imaging of 3D Defect Structure of MgOΣ5 Grain Boundary

MgOΣ5 晶界 3D 缺陷结构的原子分辨成像

• 发表时间: 2013
• 作者: M. Saito;Z. Wang;L. Gu;C. Chen;and Y. Ikuhara
• 通讯作者: and Y. Ikuhara

Atom-resolved imaging of ordered defect superstructures at individual grain boundaries

• DOI: 10.1038/nature10593
• 发表时间: 2011-11-17
• 期刊: NATURE
• 影响因子: 64.8
• 作者: Wang, Zhongchang;Saito, Mitsuhiro;Ikuhara, Yuichi
• 通讯作者: Ikuhara, Yuichi

Local atomic structure of a near-sigma 5 tilt grain boundary in MgO

• DOI: 10.1007/s10853-013-7340-7
• 发表时间: 2013-04
• 期刊: Journal of Materials Science
• 影响因子: 4.5
• 作者: M. Saito;Zhongchang Wang;S. Tsukimoto;Y. Ikuhara

MgO双結晶Σ5(310)[001]粒界に自己形成される超構造原子配列の構造解析

MgO双晶Σ(310)[001]晶界自形成超结构原子排列的结构分析

• 发表时间: 2012
• 作者: 斎藤光浩;王中長;着本享;幾原雄一
• 通讯作者: 幾原雄一