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

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    Type
    Article
    Authors
    Ding, Junfeng
    Cheng, Jianli
    Dogan, Fatih
    Li, Yangyang cc
    Lin, Weinan
    Yao, Yingbang
    Manchon, Aurelien cc
    Yang, Kesong cc
    Wu, Tao cc
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Spintronics Theory Group
    Date
    2020-08-24
    Online Publication Date
    2020-08-24
    Print Publication Date
    2020-09-23
    Embargo End Date
    2021-08-25
    Submitted Date
    2020-07-24
    Permanent link to this record
    http://hdl.handle.net/10754/665085
    
    Metadata
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    Abstract
    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 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.
    Citation
    Ding, 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
    Sponsors
    This 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.
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS applied materials & interfaces
    DOI
    10.1021/acsami.0c13337
    PubMed ID
    32829635
    Additional Links
    https://pubs.acs.org/doi/10.1021/acsami.0c13337
    ae974a485f413a2113503eed53cd6c53
    10.1021/acsami.0c13337
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Spintronics Theory Group; Material Science and Engineering Program

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