Structure of Atomically Smoothed LiNbO<sub>3</sub> (0001) Surface

  • Saito Akira
    Osaka University, Graduate School of Engineering, Department of Material and Life Science RIKEN Harima Institute SORST, Japan Science and Technology Corporation (JST)
  • Matsumoto Hideo
    Osaka University, Graduate School of Engineering, Department of Material and Life Science
  • Ohnisi Shuji
    Osaka University, Graduate School of Engineering, Department of Material and Life Science
  • Akai-Kasaya Megumi
    Osaka University, Graduate School of Engineering, Department of Material and Life Science SORST, Japan Science and Technology Corporation (JST)
  • Kuwahara Yuji
    Osaka University, Graduate School of Engineering, Department of Material and Life Science RIKEN Harima Institute SORST, Japan Science and Technology Corporation (JST)
  • Aono Masakazu
    Osaka University, Graduate School of Engineering, Department of Material and Life Science SORST, Japan Science and Technology Corporation (JST) Nanomaterials Laboratory, National Institute for Materials Science

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  • Structure of Atomically Smoothed LiNbO3 (0001) Surface

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説明

LiNbO3 (LN) is a substrate material used extensively for various optical or piezoelectric devices. We investigated an atomic-scale smoothing process of a LN single-crystal (0001) surface. Atomic force microscopy (AFM) observation revealed a surface morphology flattened from threefold symmetry to a step-terrace structure. The marked change of the surface was found to be dominated by a balance of surface diffusion and crystal growth within a period of 1–5 hours. An atomically flat surface with a straight and single-step height of 0.22 nm was obtained for a conventional LN substrate on the market. Next, we evaluated the surface composition and structure of the atomically flat LN (0001) surface by coaxial-impact collision ion scattering spectroscopy (CAICISS). We found that the atomically smoothed surface was terminated by a Nb atomic layer in which the Nb atoms were not shifted from the bulk position.

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