Conductivity and band alignment of LaCrO3/SrTiO3 (111) heterostructure

doi:10.1088/1674-1056/27/4/047301

中国物理B ›› 2018, Vol. 27 ›› Issue (4): 47301-047301.doi: 10.1088/1674-1056/27/4/047301

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Conductivity and band alignment of LaCrO₃/SrTiO₃ (111) heterostructure

Department of Physics, Beijing Normal University, Beijing 100875, China

收稿日期:2017-11-02 修回日期:2018-01-08 出版日期:2018-04-05 发布日期:2018-04-05
通讯作者: Jia-Cai Nie E-mail:jcnie@bnu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11674031, 11474022 11474024, 11422430, and 11374035) and the National Basic Research Program of China (Grant Nos. 2014CB920903, 2013CB921701, and 2013CBA01603).

Conductivity and band alignment of LaCrO₃/SrTiO₃ (111) heterostructure

Department of Physics, Beijing Normal University, Beijing 100875, China

Received:2017-11-02 Revised:2018-01-08 Online:2018-04-05 Published:2018-04-05
Contact: Jia-Cai Nie E-mail:jcnie@bnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11674031, 11474022 11474024, 11422430, and 11374035) and the National Basic Research Program of China (Grant Nos. 2014CB920903, 2013CB921701, and 2013CBA01603).

摘要/Abstract

摘要：

In this work, we investigate the electrical transport property and electronic structure of oxide heterostructure LaCrO₃/SrTiO₃ (111). The interface grown under relatively low oxygen partial pressure is found to be metallic with a conducting critical thickness of 11 unit cells of LaCrO₃. This criticality is also observed by x-ray photoelectron spectroscopy, in which the Ti³⁺ signal intensity at the spectrum edge of the Ti-2p_3/2 core level increases rapidly when the critical thickness is reached. The variations of the valence band offset and full width at half maximum of the core-level spectrum with LaCrO₃ thickness suggest that the built-in fields exist both in LaCrO₃ and in SrTiO₃. Two possible origins are proposed:the charge transfer from LaCrO₃ and the formation of a quantum well in SrTiO₃. Our results shed light on the understanding of the doping mechanism at the polar/non-polar oxide interface. Moreover, due to the interesting lattice and spin structure of LCO in the (111) direction, our work provides a basis for further exploring the novel topological quantum phenomena in this system.

关键词: oxide heterostructure, LaCrO₃/SrTiO₃ (111), x-ray photoelectron spectroscopy, electronic structure

Abstract:

Key words: oxide heterostructure, LaCrO₃/SrTiO₃ (111), x-ray photoelectron spectroscopy, electronic structure

中图分类号: (Electron states at surfaces and interfaces)

73.20.-r

73.40.-c (Electronic transport in interface structures) 82.80.Pv (Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.))

洪彦鹏, 王欣欣, 曲国良, 厉承剑, 薛红霞, 刘科践, 李永春, 熊昌民, 窦瑞芬, 何林, 聂家财. Conductivity and band alignment of LaCrO₃/SrTiO₃ (111) heterostructure[J]. 中国物理B, 2018, 27(4): 47301-047301.

Yan-Peng Hong(洪彦鹏), Xin-Xin Wang(王欣欣), Guo-Liang Qu(曲国良), Cheng-Jian Li(厉承剑), Hong-Xia Xue(薛红霞), Ke-Jian Liu(刘科践), Yong-Chun Li(李永春), Chang-Min Xiong(熊昌民), Rui-Fen Dou(窦瑞芬), Lin He(何林), Jia-Cai Nie(聂家财). Conductivity and band alignment of LaCrO₃/SrTiO₃ (111) heterostructure[J]. Chin. Phys. B, 2018, 27(4): 47301-047301.

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Conductivity and band alignment of LaCrO₃/SrTiO₃ (111) heterostructure

Conductivity and band alignment of LaCrO₃/SrTiO₃ (111) heterostructure

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