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A termination-insensitive and robust electron gas at the heterointerface of two complex oxides

Author

Listed:
  • Meng Zhang

    (Zhejiang University)

  • Kai Du

    (Zhejiang University)

  • Tianshuang Ren

    (Zhejiang University)

  • He Tian

    (Zhejiang University)

  • Ze Zhang

    (Zhejiang University)

  • Harold Y. Hwang

    (Stanford University
    SLAC National Accelerator Laboratory)

  • Yanwu Xie

    (Zhejiang University
    Nanjing University)

Abstract

The single-crystal SrTiO3 (001) has two different surface terminations, TiO2 and SrO. One most remarkable observation in previous studies is that only the heterointerfaces with TiO2-terminated SrTiO3, which usually combines with polar oxides such as LaAlO3, host an electron gas. Here we show that a robust electron gas can be generated between a non-polar oxide, CaHfO3, and SrTiO3 (001) with either termination. Unlike the well-known electron gas of LaAlO3/SrTiO3, the present one of CaHfO3/SrTiO3 essentially has no critical thickness of CaHfO3, can survive a long-time oxygen annealing at high temperature, and its transport properties are stable under exposure to water and other polar solvents. By electrostatic gating through CaHfO3, field-effect devices are demonstrated using CaHfO3/SrTiO3 heterointerfaces with both terminations. These results show that the electron gas reported in the present study is unique and promising for applications in oxide electronics.

Suggested Citation

  • Meng Zhang & Kai Du & Tianshuang Ren & He Tian & Ze Zhang & Harold Y. Hwang & Yanwu Xie, 2019. "A termination-insensitive and robust electron gas at the heterointerface of two complex oxides," Nature Communications, Nature, vol. 10(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-12036-5
    DOI: 10.1038/s41467-019-12036-5
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