Bandgap Controlling of Oxygen-Vacancy-Induced Two-Dimensional Electron Gas in SrTiO3

ORAL

Abstract

Strongly correlated oxides are full of fascinating phenomena owing to their interacting lattice, charge, spin and orbital degrees of freedom. Here we report a large bandgap enhancement in SrTiO3 thin films due to their defective nature, which was found to significantly change the electronic and magnetic phases in the oxygen-vacancy-induced two-dimensional electron gas at the interface between amorphous LaAlO3 and SrTiO3. Density functional theory calculations show the possibility of the role of Sr/Ti antisite defects on the observed properties. This may open an attractive path to tailor electronic, magnetic and optical properties of SrTiO3-based oxide interface systems under intense focus in the oxide electronics community.

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Authors

  • Zhiqi Liu

    • NUSNNI-Nanocore, National University of Singapore

  • Wenlai Lu

    • National University of Singapore

  • Shengwei Zeng

    • NUSNNI-Nanocore, National University of Singapore

  • Jiawen Deng

    • NUSNNI-Nanocore, National University of Singapore

  • Zhen Huang

    • NUSNNI-Nanocore, National University of Singapore

  • Changjian Li

    • NUSNNI-Nanocore, National University of Singapore

  • M. Motapothula

    • NUSNNI-Nanocore, National University of Singapore

  • Weiming Lu

    • NUSNNI-Nanocore, National University of Singapore

  • Jianqiang Zhong

    • National University of Singapore

  • Ping Yang

    • National University of Singapore

  • Nina Bao

    • NUSNNI-Nanocore, National University of Singapore

  • Wei Chen

    • National University of Singapore

  • Jingsheng Chen

    • National University of Singapore

  • Yuanping Feng

    • National University of Singapore

  • J.M.D. Coey

    • NUSNNI-Nanocore, National University of Singapore

  • T. Venkatesan

    • NUSNNI-Nanocore, National University of Singapore

  • Ariando Ariando

    • NUSNNI-Nanocore, National University of Singapore
    • NUSNNI-Nanocore, National University of Singapore, Singapore
    • NUSNNI-Nanocore and Physics Department, NUS, Singapore