Topological magnon bands in kagome antiferromagnets
| Project/Area Number |
20K14395
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
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| Research Institution | Tohoku University |
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Principal Investigator |
Nawa Kazuhiro 東北大学, 多元物質科学研究所, 助教 (10723215)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | カゴメ格子反強磁性体 / トポロジー / マグノン / 中性子散乱 / 反強磁性体 |
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| Outline of Research at the Start |
電子系において波動関数が波数空間上において「ひねられる」トポロジカル絶縁体の開発が進んでいる。同時にトポロジーの概念はマグノン等のボソン系にも拡張されており、強磁性体に関しては熱ホール効果や中性子非弾性散乱実験によって熱的に励起された端状態が存在しうることが示されつつある。しかし今のところ観測されている熱ホール効果と予想されるマグノンバンドのトポロジーが整合しているかは自明ではない。このギャップを埋めるべく、カゴメ格子磁性体を舞台に大型単結晶試料育成と偏極中性子非弾性散乱実験に挑戦し、波数空間上におけるスピン・テクスチャーを通じてマグノンバンドのトポロジーを検証する。
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| Outline of Final Research Achievements |
Recently, electronic properties of solids have been understood in terms of topology, which represents how wavefunctions are connected in reciprocal lattice space. The concept of topology is not only discussed for electrons but also extended to bosonic particles, such as magnons. We have investigated the magnon band topology in the Kagome lattice antiferromagnet jarosite. Single crystalline samples were grown by hydrothermal synthesis, and used for inelastic neutron scattering experiments. Dispersions of three magnon modes from the Γ point to the M point were observed. In addition, inelastic neutron scattering spectra suggest a strong direction dependence around the Γ point and the opposite intensity distribution between the magnon bands. These results are consistent with the nontrivial topology of the magnon bands around the Γ point.
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| Academic Significance and Societal Importance of the Research Achievements |
非共線磁気構造を持つ反強磁性体に関して非偏極中性子非弾性散乱実験からマグノンのねじれたトポロジーを帯びている兆候をとらえることができた例は研究代表者が知る限り本研究が初めてである。ねじれたトポロジーを生ずる原因は磁性体における副格子自由度とジャロシンスキー守谷相互作用である、電子系におけるスピンと異なる副格子自由度は磁性体を選ぶことで自由に増やしたり減らしたりすることができる。本研究をきっかけに、ねじれたトポロジーを有するマグノン物性の開発が大きく進展すると期待される。
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Report
(4 results)
Research Products
(41 results)
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[Journal Article] Strongly Electron-Correlated Semimetal RuI3 with a Layered Honeycomb Structure2021
Author(s)
Kazuhiro Nawa, Yoshinori Imai, Youhei Yamaji, Hideyuki Fujihara,Wakana Yamada, Ryotaro Takahashi, Takumi Hiraoka, Masato Hagihala, Shuki Torii, Takuya Aoyama, Takamasa Ohashi, Yasuhiro Shimizu, Hirotada Gotou, Masayuki Itoh, Kenya Ohgushi, and Taku J. Sato
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Journal Title
Jounal of the Physical Society of Japan
Volume: 90
Issue: 12
Pages: 123703-123703
DOI
NAID
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Peer Reviewed
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[Presentation] Magnetism of pseudospin-1/2 pyrochlore antiferromagnet Na3Co(CO3)2Cl2022
Author(s)
Kazuhiro Nawa, Ryo Murasaki, Clarina Dera Cluz, Shinichi Itoh, Hiraku Saito, Hiroyuki Nojiri, Daisuke Okuyama, Masahiro Yoshida, Daichi Ueta, Hideki Yoshizawa, and Taku J. Sato
Organizer
US-Japan workshop "Neutron Scattering on continuous sources future developments",
Related Report
Int'l Joint Research
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[Presentation] Magnetic structure and excitations of the Kitaev model candidate RuBr32022
Author(s)
Kazuhiro Nawa, Takumi Hiraoka, Yoshinori Imai, Ryo Murasaki, Pharit Piyawongwatthana, Maiko Kofu, Richard Mole, Wakana Yamada, Hideyuki Fujihara, Ryotaro Takahashi, Masato Hagihala, Shuki Torii, Hirotada Gotou, Kenya Ohgushi, Taku J Sato
Organizer
ICNS2022, Online, August, 2022
Related Report
Int'l Joint Research
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[Presentation] Structural and magnetic characterization of Cu2OSeO3 polymorph synthesized under high-pressure2022
Author(s)
H. C. Wu, D. Okuyama, K. Nawa, W. T. Chen, C. H. Lu, T. W. Yen, S. M. Huang, S. Calder, D. Morikawa, M. Terauchi, S. Torri, and T. J. Sato
Organizer
「量子液晶の物性科学」令和4年度領域研究会
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[Presentation] Kitaevスピン液体候補物質RuBr3の中性子非弾性散乱測定2022
Author(s)
平岡巧, 那波和宏, 今井良宗, 藤原秀行, 村崎遼, Pharit Piyawongwatthana, 古府麻衣子, Richard Mole, 後藤弘匡, 大串研也, 佐藤卓
Organizer
日本物理学会第77回年次大会
Related Report
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[Presentation] Kitaevスピン液体候補物質RuBr3の中性子散乱2021
Author(s)
平岡巧, 那波和宏, 今井良宗, 藤原秀行, 村崎遼, Pharit Piyawongwatthana, 古府麻衣子, Richard Mole, 後藤弘匡, 大串研也, 佐藤卓
Organizer
日本中性子科学会2021年大会（JSNS2021）
Related Report
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