Visualization of atomic arrangement on the surface of topological Kondo insulators by low-energy positron diffraction
| Project/Area Number |
18H03476
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 80040:Quantum beam science-related
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| Research Institution | High Energy Accelerator Research Organization (2020)
National Institutes for Quantum and Radiological Science and Technology (2018-2019) |
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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)
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| 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)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| 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)
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| 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 |
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| 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.
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| 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。
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Report
(4 results)
Research Products
(29 results)
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[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
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[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
Int'l Joint Research
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