Inversion symmetry breaking at the heterointerface of SrRuO<sub>3</sub> thin films

ORAL

Abstract

We investigate the structural symmetry of SrRuO3 thin films grown on the SrTiO3 substrate by exploiting optical second harmonic generation (SHG) technique. We observe that SHG responses are strongly dependent on the film thickness and temperature; the azimuth-dependence becomes more anisotropic as the film becomes thicker, and the SHG response diminishes as temperature increases above 400 K. We analyze the azimuth dependences by considering the electric dipole and electric quadrupole contributions, and find that the tetragonal and orthorhombic phases are stabilized in fully strained and strain-relaxed regions, respectively. In particular, we demonstrate that the inversion-symmetry-broken state emerges as a stable phase at the interface between centrosymmetric tetragonal and orthorhombic phases.

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Presenters

  • Chang Jae Roh

    • Gwangju Institute of Science and Technology
    • Department of Physics and Photon science, Gwangju Institute of Science and Technology

Authors

  • Chang Jae Roh

    • Gwangju Institute of Science and Technology
    • Department of Physics and Photon science, Gwangju Institute of Science and Technology

  • Jeong Rae Kim

    • Department of physics, Seoul National University

  • Yong Ryun Jo

    • Department of Materials Science and Engineering, Gwangju Institute of Science and Technology

  • Jeong Gi Choi

    • Gwangju Institute of Science and Technology
    • Department of Physics and Photon science, Gwangju Institute of Science and Technology

  • Jin Kwon Kim

    • Department of physics, Seoul National University

  • Yeongjae Shin

    • Department of physics, Seoul National University
    • Department of Applied Physics, Yale

  • Bongju Kim

    • Department of physics, Seoul National University
    • Seoul National University

  • Bong Joong Kim

    • Department of Materials Science and Engineering, Gwangju Institute of Science and Technology

  • Tae Won Noh

    • Center for Correlated Electron Systems (CCES), Institute for Basic Science (IBS)
    • Department of physics, Seoul National University
    • Institute for Basic Science

  • Jongseok Lee

    • Gwangju Institute of Science and Technology
    • Department of Physcis and Photon Science, Gwangju Institute of Science and Technology, Korea
    • Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju, South Korea
    • Department of Physics and Photon science, Gwangju Institute of Science and Technology
    • Department of Physics and Photon Science, Gwangju Institute of Science and Technology
    • Physics and photon science, GIST