• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Visualization of atomic arrangement on the surface of topological Kondo insulators by low-energy positron diffraction

Research Project

Project/Area Number 18H03476
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 80040:Quantum beam science-related
Research InstitutionHigh Energy Accelerator Research Organization (2020)
National Institutes for Quantum and Radiological Science and Technology (2018-2019)

Principal Investigator

Wada Ken  大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 准教授 (10401209)

Co-Investigator(Kenkyū-buntansha) 望月 出海  大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 助教 (30579058)
白澤 徹郎  国立研究開発法人産業技術総合研究所, 計量標準総合センター, 主任研究員 (80451889)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2018: ¥13,260,000 (Direct Cost: ¥10,200,000、Indirect Cost: ¥3,060,000)
Keywords低速陽電子ビーム / 低速陽電子回折 / 低速電子回折 / 表面 / 陽電子 / 構造解析
Outline of Final Research Achievements

Low-energy positron diffraction is a positron version of low-energy electron diffraction, and it has been proposed as an ideal method for analyzing crystal surface structures, even on surfaces containing heavy elements. However, it is difficult to obtain sufficient beam intensity for diffraction experiments due to the use of antiparticles. We have developed a low-energy positron diffractometer using an accelerator-based high-intensity slow-positron beam and have successfully observed diffraction patterns. The initial detector with a two-layer delay-line anode had a large cross-shaped dead area. We have developed a new low-energy electron/positron diffractometer using a three-layer delay-line anode to observe the diffraction pattern without the cross-shaped dead area. In addition, a surface structure analysis code for LEPD has been developed, which enables us to analyze the surface structure by LEPD.

Academic Significance and Societal Importance of the Research Achievements

次世代電子デバイスや先進触媒材料の研究分野において,物質の表面に発現する物理現象の研究は益々その重要度を増している。物質表面の特異な電子状態の観測やその他の機能計測と共に,それら物理現象の発現の源となる原子位置座標に関する研究は重要である。本研究成果によって,理想的な表面構造解析手法として提言されてきた低速陽電子回折法による表面原子位置座標の構造解析手法の整備が進んだことで,同手法による今後の応用研究の進展が期待できるようになった。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (29 results)

All 2021 2020 2019 2018

All Journal Article (6 results) (of which Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (23 results) (of which Int'l Joint Research: 6 results,  Invited: 6 results)

  • [Journal Article] Positronium formation at 4H SiC(0001) surfaces2020

    • Author(s)
      Kawasuso A、Wada K、Miyashita A、Maekawa M、Iwamori H、Iida S、Nagashima Y
    • Journal Title

      Journal of Physics: Condensed Matter

      Volume: 33 Issue: 3 Pages: 035006-035006

    • DOI

      10.1088/1361-648x/abbe7a

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Development a new positron source for spin-polarized positron beam generation2020

    • Author(s)
      M. Maekawa, K. Wada, A. Kawasuso
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

      Volume: 480 Pages: 49-55

    • DOI

      10.1016/j.nimb.2020.08.001

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A pulse stretcher for a LINAC-based pulsed slow-positron beam providing a quasi-continuous beam with an energy of 5.2 keV2020

    • Author(s)
      K. Wada, M. Maekawa, I. Mochizuki, T. Shidara, A. Kawasuso, M. Kimura, T. Hyodo
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

      Volume: 975 Pages: 164161-164161

    • DOI

      10.1016/j.nima.2020.164161

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] First Observation of a Low-Energy Positron Diffraction Pattern with a Linac-Based Beam2019

    • Author(s)
      K. Wada, T. Shirasawa, I. Mochizuki, M. Fujinami, M. Maekawa, A. Kawasuso, T. Takahashi, T. Hyodo
    • Journal Title

      Photon Factory Highlights

      Volume: 2018 Pages: 66-67

    • Related Report
      2019 Annual Research Report
    • Open Access
  • [Journal Article] Observation of Low-Energy Positron Diffraction Patterns with a Linac-Based Slow-Positron Beam2018

    • Author(s)
      Wada Ken、Shirasawa Tetsuroh、Mochizuki Izumi、Fujinami Masanori、Maekawa Masaki、Kawasuso Atsuo、Takahashi Toshio、Hyodo Toshio
    • Journal Title

      e-Journal of Surface Science and Nanotechnology

      Volume: 16 Issue: 0 Pages: 313-319

    • DOI

      10.1380/ejssnt.2018.313

    • NAID

      130007386484

    • ISSN
      1348-0391
    • Year and Date
      2018-06-30
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Slow positron applications at slow positron facility of institute of materials structure science, KEK2018

    • Author(s)
      T. Hyodo, I. Mochizuki, K. Wada, N. Toge, and T. Shidara
    • Journal Title

      AIP Conference Proceedings

      Volume: 1970 Pages: 040004-040004

    • DOI

      10.1063/1.5040216

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 加速器ベース低速陽電子ビームによる陽電子回折実験の現状と将来展望2021

    • Author(s)
      和田健
    • Organizer
      日本表面真空学会 2021年度関東支部講演大会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] 低速陽電子実験施設報告2021

    • Author(s)
      永井康介, 和田健, 望月出海, Rezwan Ahmed, 兵頭俊夫
    • Organizer
      2020年度量子ビームサイエンスフェスタ
    • Related Report
      2020 Annual Research Report
  • [Presentation] 3層遅延線アノード検出器を用いた低速電子回折図形の観測と 低速陽電子回折実験への応用2021

    • Author(s)
      和田健, 白澤徹郎, 望月出海, Rezwan Ahmed, 前川雅樹, 河裾厚男, 兵頭俊夫
    • Organizer
      低速陽電子実験施設研究会
    • Related Report
      2020 Annual Research Report
  • [Presentation] KEK物構研低速陽電子実験施設における低速陽電子ビーム生成ユニットの更新2020

    • Author(s)
      和田健, 望月出海, 兵頭俊夫, 永井康介, 保住弥紹, 井上均, 高富俊和, 岩瀬広, 峠暢一
    • Organizer
      京都大学複合原子力科学研究所専門研究会「陽電子科学とその理工学への応用」(2020年)
    • Related Report
      2020 Annual Research Report
  • [Presentation] 低速陽電子回折法による表面構造解析2020

    • Author(s)
      兵頭俊夫, 和田健, 白澤徹郎, 望月出海, 藤浪真紀, 前川雅樹, 河裾厚男, 高橋敏男
    • Organizer
      2019年度量子ビームサイエンスフェスタ
    • Related Report
      2019 Annual Research Report
  • [Presentation] 低速陽電子回折(LEPD)ステーションの開発とイニシャルデータの取得2020

    • Author(s)
      和田健
    • Organizer
      2019年度量子ビームサイエンスフェスタ
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] センターホール付き3層遅延線アノード検出器の低速陽電子回折(LEPD)装置への導入2019

    • Author(s)
      和田健, 白澤徹郎, 望月出海, 藤浪真紀, 前川雅樹, 河裾厚男, 高橋敏男, 兵頭俊夫
    • Organizer
      京都大学複合原子力科学研究所専門研究会「陽電子科学とその理工学への応用」
    • Related Report
      2019 Annual Research Report
  • [Presentation] A low-energy positron diffraction (LEPD) experiment station for a linac-based slow-positron beam2019

    • Author(s)
      K. Wada, T. Shirasawa, I. Mochizuki, M. Fujinami, T. Takahashi, M. Maekawa, A. Kawasuso, T. Hyodo
    • Organizer
      TIA Kakehashi Symposium, Application of Positron Beams at Major Facilities (Satellite session of 4th Japan-China Joint Workshop on Positron Science (JWPS 2019))
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Observation of low-energy positron diffraction patterns with a linac-based slow-positron beam2019

    • Author(s)
      K. Wada, T. Shirasawa, I. Mochizuki, M. Fujinami, M. Maekawa, A. Kawasuso, T. Takahashi, T. Hyodo
    • Organizer
      2019年日本表面真空学会学術講演会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 低速陽電子回折(LEPD)の特徴と装置開発2019

    • Author(s)
      和田健, 白澤徹郎, 望月出海, 藤浪真紀, 前川雅樹, 河裾厚男, 高橋敏男, 兵頭俊夫
    • Organizer
      2019年日本表面真空学会学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 低速陽電子回折装置の開発2019

    • Author(s)
      和田健, 白澤徹郎, 望月出海, 藤浪真紀, 前川雅樹, 河裾厚男, 高橋敏男, 兵頭俊夫
    • Organizer
      VACUUM2019真空展「大学・公的機関における真空科学・技術・応用の最先端研究紹介」
    • Related Report
      2019 Annual Research Report
  • [Presentation] A low-energy positron diffraction (LEPD) experiment station for a linac-based slow-positron beam2019

    • Author(s)
      K. Wada, T. Shirasawa, I. Mochizuki, M. Fujinami, M. Maekawa, A. Kawasuso, T. Takahashi, T. Hyodo
    • Organizer
      15th International Workshop on Slow Positron Beam Techniques & Applications (SLOPOS-15)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Present Status of the Slow Positron Facility of Institute of Materials Structure Science, KEK2019

    • Author(s)
      I. Mochizuki, K. Wada, Y. Fukaya, T. Shirasawa, Y. Endo, A. Takayama, S. Hasegawa, A. Ichimiya, Y. Nagashima, Masaki Maekawa, Atsuo Kawasuso, A. Ishida, N. Toge, K. Furukawa, Y. Nagai, T. Hyodo
    • Organizer
      15th International Workshop on Slow Positron Beam Techniques & Applications (SLOPOS-15)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Ge(001)-2x1表面からの低速陽電子回折図 形の観測II2019

    • Author(s)
      和田健, 白澤徹郎, 望月出海, 藤浪真紀, 前川雅樹, 河裾厚男, 高橋敏男, 兵頭俊夫
    • Organizer
      日本アイソトープ協会第56回アイソトープ・放射線研究発表会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 加速器ベース低速陽電子ビームを用いた低速陽電子回折実験装置の開発II2019

    • Author(s)
      和田健, 白澤徹郎, 望月出海, 藤浪真紀, 前川雅樹, 河裾厚男, 高橋敏男, 兵頭俊夫
    • Organizer
      日本物理学会第74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 低速陽電子回折法による表面構造解析2019

    • Author(s)
      兵頭俊夫, 和田健, 白澤徹郎, 望月出海, 藤浪真紀, 前川雅樹, 河裾厚男, 高橋敏男
    • Organizer
      2018年度量子ビームサイエンスフェスタ 2019年3月12日
    • Related Report
      2018 Annual Research Report
  • [Presentation] 低速陽電子回折法の特徴と新規開発装置によるイニシャルデータの解析2019

    • Author(s)
      和田 健
    • Organizer
      第66回応用物理学会春季学術講演会シンポジウム「陽電子回折による表面科学の新展開と高速化データ駆動科学」
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] 低速陽電子回折実験装置の開発 II2018

    • Author(s)
      和田健, 白澤徹郎, 望月出海, 藤浪真紀, 前川雅樹, 河裾厚男, 高橋敏男, 兵頭俊夫
    • Organizer
      京都大学原子炉実験所専門研究会「陽電子科学とその理工学への応用」
    • Related Report
      2018 Annual Research Report
  • [Presentation] Pulse Stretching System for Materials at KEK Slow Positron Facility2018

    • Author(s)
      T. Hyodo, K. Wada, M. Masaki, I. Mochizuki, A. Kawasuso, M. Kimura
    • Organizer
      4th Symposium on Innovative Measurement and Analysis for Structural Materials
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Observation of Low-Energy Positron Diffraction (LEPD) Patterns and LEPD I-V Characteristics2018

    • Author(s)
      K. Wada, T. Shirasawa, I. Mochizuki, M. Fujinami, M. Maekawa, A. Kawasuso, T. Takahashi, T. Hyodo
    • Organizer
      14th International Conference on Atomically Controlled Surfaces, Interfaces and Nanostructures (ACSIN-14)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Observation of low-energy positron diffraction with a linac-based slow-positron beam and its applications as a tool for surface structural analysis2018

    • Author(s)
      K. Wada, T. Shirasawa, I. Mochizuki, M. Fujinami, M. Maekawa, A. Kawasuso, T. Takahashi, T. Hyodo
    • Organizer
      18th International Conference on Positron Annihilation (ICPA-18)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Ge(001)-2x1表面からの低速陽電子回折図形の観測2018

    • Author(s)
      和田健, 白澤徹郎, 望月出海, 藤浪真紀, 前川雅樹, 河裾厚男, 高橋敏男, 兵頭俊夫
    • Organizer
      日本アイソトープ協会第55回アイソトープ・放射線研究発表会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Ge(001)-2x1表面における低速陽電子回折パターンの観測2018

    • Author(s)
      和田健, 白澤徹郎, 望月出海, 藤浪真紀, 前川雅樹, 河裾厚男, 高橋敏男, 兵頭俊夫
    • Organizer
      日本表面科学会第3回関東支部講演大会
    • Related Report
      2018 Annual Research Report

URL: 

Published: 2018-04-23   Modified: 2022-01-27  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi