Microscopic studies of the valleytronics materials by polarized ESR spectroscopy

• Project/Area Number: 16K04882
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nanostructural physics
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: Oshima Yugo 国立研究開発法人理化学研究所, 開拓研究本部, 専任研究員 (10375107)
• Research Collaborator: TAKENOBU TAISHI
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2016: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
• Keywords: 単層遷移金属ダイカルコゲナイド / 電子スピン共鳴 / スピンエレクトロニクス / 物性実験

Outline of Final Research Achievements

The purposes of this project were to built a novel ESR system using wire grid polarizers for millimeter/sub-millimeter waves, and to measure the ESR of the monolayer transition metal dichalcogenides for clarifying its microscopic information such as the g-value or the spin-orbit interaction. Although we have succeeded to develop the ESR system using wire grid polarizers, the sensitivity was not sufficient to observe the ESR of the monolayer transition metal dichalcogenides.

Academic Significance and Societal Importance of the Research Achievements

今回、ミリ波・サブミリ波に適したワイヤーグリッド偏光子をレザー微細加工法により初めて作製したが、従来の手法で作製したワイヤーグリッド偏光子と遜色のない性能を持つものが作製できるという事がわかった。また、ワイヤーグリッド偏光子を利用した電子スピン共鳴装置を新たに開発した事によって、従来型の共振器を使った電子スピン共鳴装置に比べ若干感度が上がった。今後、導波路をコルゲート導波管に変更すれば、さらなる感度の向上が期待できる。

Research Products

• [Journal Article] Evidence of low-energy singlet excited states in the spin-1/2 polyhedral clusters {Mo72V30} and {W72V30} with strongly frustrated kagome networks (2019)
  • Author(s): Kihara T.、Nojiri H.、Narumi Y.、Oshima Y.、Kindo K.、Heesing C.、Schnack J.、Muller A.
  • Journal Title: Physical Review B Volume: 99 Issue: 6 Pages: 64430-64430
  • DOI: 10.1103/physrevb.99.064430
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Detailed X-band Studies of the π?d Molecular Conductor λ-(BETS)2FeCl4: Observation of Anomalous Angular Dependence of the g-value (2018)
  • Author(s): Lee Taehoon、Oshima Yugo、Cui Hengbo、Kato Reizo
  • Journal Title: Journal of the Physical Society of Japan Volume: 87 Issue: 11 Pages: 114702-114702
  • DOI: 10.7566/jpsj.87.114702
  • NAID: 210000135011
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Fungus-derived hydroxyl radicals kill hepatic cells by enhancing nuclear transglutaminase (2017)
  • Author(s): Shrestha Ronak、Shrestha Rajan、Qin Xian-Yang、Kuo Ting-Fang、Oshima Yugo、Iwatani Shun、Teraoka Ryutaro、Fujii Keisuke、Hara Mitsuko、Li Mengqian、Takahashi-Nakaguchi Azusa、Chibana Hiroji、Lu Jun、Cai Muyi、Kajiwara Susumu、Kojima Soichi
  • Journal Title: Scientific Reports Volume: 7 Issue: 1 Pages: 4746-4746
  • DOI: 10.1038/s41598-017-04630-8
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Antiferromagnetic Insulating Ground State of Molecular π-d System λ-(BETS)2FeCl4 (BETS = Bis(ethylenedithio)tetraselenafulvalene): A Theoretical and Experimental Review (2017)
  • Author(s): Y. Oshima, H. B. Cui, and R. Kato
  • Journal Title: Magnetochemistry Volume: 3 Issue: 1 Pages: 10-10
  • DOI: 10.3390/magnetochemistry3010010
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] 分子性物質・原子層物質のための高感度ESR測定装置の開発 (2018)
  • Author(s): 大島勇吾、木村尚次郎、加藤礼三、蒲江、竹延大志
  • Organizer: 日本物理学会 2018年秋季大会 同志社大学
• [Presentation] 機能性物質・生体試料のための高感度および空間分解能ESR測定装置の開発 (2018)
  • Author(s): 大島勇吾、木村尚次郎、関原早苗、小嶋聡一、加藤礼三
  • Organizer: 第57回電子スピンサイエンス学会年会 北海道大学
• [Presentation] Development of high-sensitive ESR sysytem for functional and molecular materials (2018)
  • Author(s): Y. Oshima
  • Organizer: 4th International Conference on Functional Materials Science 2018, Bali, Indonesia
  • Int'l Joint Research / Invited
• [Presentation] 電子スピン共鳴を用いた分子性物質の研究 (2017)
  • Author(s): 大島勇吾
  • Organizer: 物質階層原理研究 第１回合宿
• [Presentation] Multi-frequency ESR Studies of Molecular Magnets: Application to pi-d electrons system and spin-liquid system (2017)
  • Author(s): Yugo Oshima
  • Organizer: RIKEN Symposium & Joint Workshop between RIKEN Nishina Center and USM, Penang, Malaysia
  • Int'l Joint Research / Invited
• [Presentation] Development of a high-sensitive ESR system using wire grid polarizer (2017)
  • Author(s): Y. Oshima
  • Organizer: 理化学研究所 第15回異分野交流の夕べ
  • Place of Presentation: 理化学研究所 和光事業所（埼玉県和光市）
• [Remarks] 加藤分子物性研究室
  • URL: http://www2.riken.jp/lab-www/molecule/index.html
• [Remarks] 加藤分子物性研究室
  • URL: http://www.riken.jp/lab-www/molecule/index.html