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dc.contributor.authorDing, Junfeng
dc.contributor.authorCheng, Jianli
dc.contributor.authorDogan, Fatih
dc.contributor.authorLi, Yangyang
dc.contributor.authorLin, Weinan
dc.contributor.authorYao, Yingbang
dc.contributor.authorManchon, Aurelien
dc.contributor.authorYang, Kesong
dc.contributor.authorWu, Tao
dc.date.accessioned2020-09-13T11:49:33Z
dc.date.available2020-09-13T11:49:33Z
dc.date.issued2020-08-24
dc.date.submitted2020-07-24
dc.identifier.citationDing, J., Cheng, J., Dogan, F., Li, Y., Lin, W., Yao, Y., … Wu, T. (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. doi:10.1021/acsami.0c13337
dc.identifier.issn1944-8244
dc.identifier.pmid32829635
dc.identifier.doi10.1021/acsami.0c13337
dc.identifier.urihttp://hdl.handle.net/10754/665085
dc.description.abstractTwo-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 Å, 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 ∼4 Å. 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.
dc.description.sponsorshipThis work was performed by the Clean Combustion Research Center with funding from King Abdullah University of Science and Technology (KAUST), University of California, San Diego and Saudi Aramco under the FUELCOM program. Research reported in this publication was also supported by competitive research funding from KAUST.
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttps://pubs.acs.org/doi/10.1021/acsami.0c13337
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS applied materials & interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acsami.0c13337.
dc.titleTwo-Dimensional Electron Gas at the Spinel/Perovskite Interface: Suppression of Polar Catastrophe by an Ultrathin Layer of Interfacial Defects.
dc.typeArticle
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentSpintronics Theory Group
dc.identifier.journalACS applied materials & interfaces
dc.rights.embargodate2021-08-25
dc.eprint.versionPost-print
dc.contributor.institutionKey Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
dc.contributor.institutionDepartment of NanoEngineering, University of California, San Diego, La Jolla, California 92093-0448, United States
dc.contributor.institutionCollege of Engineering and Technology, American University of the Middle East, Kuwait
dc.contributor.institutionDepartment of Materials Science and Engineering, National University of Singapore, 117575 Singapore
dc.contributor.institutionSchool of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, People’s Republic of China
dc.contributor.institutionAix-Marseille Univ, CNRS, CINaM, Marseille 13288, France
dc.contributor.institutionSchool of Materials Science and Engineering, University of New South Wales (UNSW), Sydney, NSW 2052, Australia
kaust.personManchon, Aurelien
dc.date.accepted2020-08-24
kaust.acknowledged.supportUnitClean Combustion Research Center
dc.date.published-online2020-08-24
dc.date.published-print2020-09-23


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