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Two-Dimensional Electron Gas at the Spinel/Perovskite Interface: Suppression of Polar Catastrophe by an Ultrathin Layer of Interfacial Defects

文献类型：期刊论文

作者Ding, Junfeng2; Cheng, Jianli3; Dogan, Fatih4; Li, Yangyang1; Lin, Weinan1; Yao, Yingbang5; Manchon, Aurelien6,7; Yang, Kesong3; Wu, Tom8
刊名ACS APPLIED MATERIALS & INTERFACES
出版日期2020-09-23
卷号12
关键词oxide interface two-dimensional electron gas spinel perovskite titanium oxides
ISSN号1944-8244
DOI10.1021/acsami.0c13337
通讯作者Yang, Kesong(kesong@ucsd.edu) ; Wu, Tom(tom.wu@unsw.edu.au)
英文摘要Two-dimensional electron gas (2DEG) at the interface between two insulating perovskite oxides has attracted much interest for both fundamental physics and potential applications. Here, we report the discovery of a new 2DEG formed at the interface between spinel MgAl2O4 and perovskite SrTiO3. Transport measurements, electron microscopy imaging, and first-principles calculations reveal that the interfacial 2DEG is closely related to the symmetry breaking at the MgAl2O4/SrTiO3 interface. The critical film thickness for the insulator-to-metal transition is approximately 32 angstrom, which is twice as thick as that reported on the widely studied LaAlO3/SrTiO3 system. Scanning transmission electron microscopy imaging indicates the formation of interfacial Ti-Al antisite defects with a thickness of similar to 4 angstrom. First-principles density functional theory calculations indicate that the coexistence of the antisite defects and surface oxygen vacancies may explain the formation of interfacial 2DEG as well as the observed critical film thickness. The discovery of 2DEG at the spinel/perovskite interface introduces a new material platform for designing oxide interfaces with desired characteristics.
WOS关键词METAL-INSULATOR-TRANSITION ; TOTAL-ENERGY CALCULATIONS ; ROOM-TEMPERATURE ; HETEROSTRUCTURES
资助项目National Natural Science Foundation of China[51672279] ; National Natural Science Foundation of China[51727806] ; National Natural Science Foundation of China[11874361] ; National Natural Science Foundation of China[11774354] ; Science Challenge Project[TZ2016001] ; CASHIPS Director's Fund[YZJJ201705] ; Academic Senate General Campus Research Grant Committee at University of California San Diego
WOS研究方向Science & Technology - Other Topics ; Materials Science
语种英语
WOS记录号WOS:000575557800056
出版者AMER CHEMICAL SOC
资助机构National Natural Science Foundation of China ; Science Challenge Project ; CASHIPS Director's Fund ; Academic Senate General Campus Research Grant Committee at University of California San Diego
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/104446]  
专题中国科学院合肥物质科学研究院
通讯作者Yang, Kesong; Wu, Tom
作者单位1.Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117575, Singapore
2.Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, HFIPS, Hefei 230031, Peoples R China
3.Univ Calif San Diego, Dept NanoEngn, La Jolla, CA 92093 USA
4.Amer Univ Middle East, Coll Engn & Technol, Kuwait, Kuwait
5.Guangdong Univ Technol, Sch Mat & Energy, Guangzhou 510006, Peoples R China
6.Aix Marseille Univ, CINaM, CNRS, F-13288 Marseille, France
7.King Abdullah Univ Sci & Technol, Phys Sci & Engn Div, Thuwal, Saudi Arabia
8.Univ New South Wales UNSW, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia
推荐引用方式
GB/T 7714		 Ding, Junfeng,Cheng, Jianli,Dogan, Fatih,et al. Two-Dimensional Electron Gas at the Spinel/Perovskite Interface: Suppression of Polar Catastrophe by an Ultrathin Layer of Interfacial Defects[J]. ACS APPLIED MATERIALS & INTERFACES,2020,12.
APA Ding, Junfeng.,Cheng, Jianli.,Dogan, Fatih.,Li, Yangyang.,Lin, Weinan.,...&Wu, Tom.(2020).Two-Dimensional Electron Gas at the Spinel/Perovskite Interface: Suppression of Polar Catastrophe by an Ultrathin Layer of Interfacial Defects.ACS APPLIED MATERIALS & INTERFACES,12.
MLA Ding, Junfeng,et al."Two-Dimensional Electron Gas at the Spinel/Perovskite Interface: Suppression of Polar Catastrophe by an Ultrathin Layer of Interfacial Defects".ACS APPLIED MATERIALS & INTERFACES 12(2020).

入库方式： OAI收割

来源：合肥物质科学研究院

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