Freestanding Crystalline Monolayers of Oxide Perovskites

ORAL

Abstract

Two-dimensional (2D) materials like graphene have demonstrated new electronic phases can emerge when a bulk crystal is thinned down to a mono-layer. As transition metal oxide perovskites host a variety of correlated phases, realizing the analogs with oxide perovskite materials would open the door to a rich spectrum of exotic 2D correlated phases that have not yet been explored. Here we report on the fabrication of freestanding perovskite films with high crystalline quality down to a single unit cell. Using the recently developed method based on water-soluble Sr3Al2O6 as the sacrificial buffer layer we synthesize freestanding SrTiO3 and BiFeO3 ultrathin films by reactive molecular beam epitaxy and transfer them to different substrates such as crystalline silicon wafers and holey carbon films. We find that freestanding BiFeO3 films exhibit an unexpected giant tetragonality and polarization when approaching the ultimate 2D limit. The ability to synthesize crystalline freestanding perovskite films without thickness limitation opens a new field for the 2D correlated electronic phases and interfacial phenomena.

*We thank 973 Program (2015CB654901), NSFC program (51772143, 11474147, 11574135, 51672125, 11774153, 11874199), and NSF under the Nebraska MRSEC program (DMR-1420645).

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Presenters

  • Yuefeng Nie

    • College of Engineering and Applied Sciences, Nanjing University
    • National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University
    • Nanjing University
    • National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, Nanjing Univ

Authors

  • Dianxiang Ji

    • National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University
    • Nanjing University
    • National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, Nanjing Univ

  • Songhua Cai

    • National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University

  • Tula Paudel

    • Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln
    • University of Nebraska - Lincoln

  • Haoying Sun

    • National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University
    • Nanjing University

  • Chuncheng Zhang

    • National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University

  • Lu Han

    • National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University
    • Nanjing University

  • Yifan Wei

    • National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University

  • Yipeng Zang

    • National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University
    • Nanjing University

  • Min Gu

    • College of Engineering and Applied Sciences, Nanjing University
    • National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University

  • Yi Zhang

    • Department of Chemical Engineering and Materials Science and Department of Physics and Astronomy, University of California, Irvine

  • Wenpei Gao

    • Department of Chemical Engineering and Materials Science and Department of Physics and Astronomy, University of California, Irvine
    • Department of Materials Science and Engineering, University of California, Irvine

  • Huaixun Huyan

    • Department of Chemical Engineering and Materials Science and Department of Physics and Astronomy, University of California, Irvine
    • Department of Materials Science and Engineering, University of California, Irvine

  • Wei Guo

    • National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University
    • Nanjing University

  • Di Wu

    • National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University

  • Zhengbin Gu

    • National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University
    • Nanjing University

  • Evgeny Y Tsymbal

    • Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln
    • University of Nebraska - Lincoln
    • Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln
    • Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska - Lincoln
    • Institute of Physics

  • Peng Wang

    • College of Engineering and Applied Sciences, Nanjing University
    • National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University

  • Yuefeng Nie

    • College of Engineering and Applied Sciences, Nanjing University
    • National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University
    • Nanjing University
    • National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, Nanjing Univ

  • Xiaoqing Pan

    • Department of Physics and Astronomy, University of California, Irvine
    • Department of Chemical Engineering and Materials Science and Department of Physics and Astronomy, University of California, Irvine