δ-Doping of oxygen vacancies dictated by thermodynamics in epitaxial SrTiO3 films

被引：8

作者：

Li, Fengmiao ^{[1
,2
,3
]}

Yang, Fang ^{[1
,2
]}

Liang, Yan ^{[1
,2
]}

Li, Shanming ^{[1
,2
]}

Yang, Zhenzhong ^{[1
,2
]}

Zhang, Qinghua ^{[1
,2
]}

Li, Wentao ^{[1
,2
]}

Zhu, Xuetao ^{[1
,2
]}

Gu, Lin ^{[1
,2
]}

Zhang, Jiandi ^{[4
]}

Plummer, E. W. ^{[4
]}

Guo, Jiandong ^{[1
,2
,5
,6
]}

机构：

[1] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[3] Univ British Columbia, Stewart Blusson Quantum Matter Inst, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

[4] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

[5] Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China

[6] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100190, Peoples R China

来源：

AIP ADVANCES | 2017年 / 7卷 / 06期

关键词：

ELECTRON-GAS; SUBSTRATE; GROWTH; VACUUM;

D O I：

10.1063/1.4985048

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Homoepitaxial SrTiO3(110) film is grown by molecular beam epitaxy in ultra-high vacuum with oxygen diffusing from substrate as the only oxidant. The resulted oxygen vacancies (V(O)s) are found to be spatially confined within few subsurface layers only, forming a quasi-two-dimensional doped region with a tunable high concentration. Such a delta-function distribution of VOs is essentially determined by the thermodynamics associated with the surface reconstruction, and facilitated by the relatively high growth temperature. Our results demonstrate that it is feasible to tune VOs distribution at the atomic scale by controlling the lattice structure of oxide surfaces. (C) 2017 Author(s).

引用

页数：7

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