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Development of Topological Nanophononics for the Beyond 5G Era

Research Project

Project/Area Number 21K18877
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 28:Nano/micro science and related fields
Research InstitutionOkayama University

Principal Investigator

Tsuruta Kenji  岡山大学, 自然科学学域, 教授 (00304329)

Co-Investigator(Kenkyū-buntansha) 三澤 賢明  岡山大学, 自然科学学域, 助教 (00823791)
大村 訓史  広島工業大学, 工学部, 准教授 (90729352)
羽田 真毅  筑波大学, 数理物質系, 准教授 (70636365)
Project Period (FY) 2021-07-09 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2022: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2021: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords音響トポロジカル絶縁体 / テラヘルツ弾性波 / 第一原理フォノン解析 / 時間依存密度汎関数法 / 時間分解電子線回折実験 / 局在フォノン / 時間依存第一原理分子動力学シミュレーション / 人工ニューラルネット分子動力学 / 時間依存密度汎関数分子動力学シミュレーション
Outline of Research at the Start

本研究では,近年注目が集まるトポロジカル絶縁体の概念を,音波・弾性波に拡張した“トポロジカル・フォノニクス”により,Beyond5G時代の超高周波弾性波デバイス実現に向けた設計と実証を目指す。波動現象においてトポロジーは不変量の一つであり,界面・表面において不純物や構造乱れの影響を受けない“トポロジーに保護されたエッジモード”が発現する。本研究では,弾性波のトポロジカルエッジモードを励起・制御するナノ構造を理論設計し,第一原理/分子動力学シミュレーション,電子線回折実験により実証する。さらに,光励起を介した新しい制御法の可能性も追及する。

Outline of Final Research Achievements

In this study, the concept of topological insulators is extended to sound waves and elastic waves, called "topological phononics", with the aim of demonstrating the operating principle of ultrahigh-frequency elastic wave devices in the Beyond 5G era. Exploring atomic-level topological interfaces, we have demonstrated the possibility of realizing a topological waveguide in the THz band by introducing grain boundaries into graphene on boron nitride.
In addition, we investigated the atomic dynamics in the photoexcited state in the carbon nanotubes/boron nitride nanotube heterostructure through combined analyses of ultrafast time-resolved electron diffraction and time-dependent density functional theory. We found that the charge transfer occurs within one pico-second, which induces a phonon transport.

Academic Significance and Societal Importance of the Research Achievements

Beyond 5G/6Gが社会実装されるには,THz帯で動作するナノスケール弾性波デバイスの設計法確立が喫緊の課題である。しかし,弾性波デバイスをTHz帯まで引き上げることは,熱的な分子振動の領域とも重なり,既存の概念に基づく設計のみでは,実現は難しい。
一方,トポロジカル絶縁体理論を援用し,フォノンの“トポロジーに保護されたエッジ状態”が発現する結晶粒界構造や人工周期構造を設計できれば,この問題を一気に解決する可能性がある。本研究は,ナノスケールのトポロジカル・フォノニクスの学理構築,さらに電子励起と組み合わせたスイッチング機能の可能性を探索した他に例を見ない取り組みである。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (26 results)

All 2023 2022 2021 Other

All Int'l Joint Research (1 results) Journal Article (7 results) (of which Peer Reviewed: 3 results,  Open Access: 6 results) Presentation (16 results) (of which Int'l Joint Research: 7 results,  Invited: 5 results) Remarks (2 results)

  • [Int'l Joint Research] レンヌ第一大学(フランス)

    • Related Report
      2022 Annual Research Report
  • [Journal Article] Reconfigurable waveguide based on valley topological phononic crystals with local symmetry inversion via continuous translation2023

    • Author(s)
      Ali Md. Shuzon, Motoki Kataoka, Masaaki Misawa, Kenji Tsuruta
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 62 Issue: SJ Pages: SJ1002-SJ1002

    • DOI

      10.35848/1347-4065/acae63

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Acoustic metasurfaces and topological phononics for acoustic/elastic device design2023

    • Author(s)
      Kenji Tsuruta
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 62 Issue: SJ Pages: SJ0803-SJ0803

    • DOI

      10.35848/1347-4065/acc6da

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Design and Robustness Evaluation of Valley Topological Elastic Wave Propagation in a Thin Plate with Phononic Structure2022

    • Author(s)
      Motoki Kataoka, Masaaki Misawa, Kenji Tsuruta
    • Journal Title

      Symmetry

      Volume: 14 Issue: 10 Pages: 2133-2133

    • DOI

      10.3390/sym14102133

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Higher-order Band Control and Topological Elastic Waveguide Design using Resonant-type Phononic Crystals2022

    • Author(s)
      Yuito Ohashi, Motoki Kataoka, Hiroaki Takeshita, Masaaki Misawa, Kenji Tsuruta
    • Journal Title

      Proceedings of Symposium on Ultrasonic Electronics (USE2022)

      Volume: 43

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] Design of Topological Phononic Structure and Application to Thin Plate Elastic Wave2022

    • Author(s)
      Motoki Kataoka, Yuito Ohashi, Masaaki Misawa, Kenji Tsuruta
    • Journal Title

      Proceedings of Symposium on Ultrasonic Electronics (USE2022)

      Volume: 43

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] Reconfigurable Waveguide Design in Valley-Topological Phononic Crystal2022

    • Author(s)
      Md. Shuzon Ali, Motoki Kataoka, Masaaki Misawa, Kenji Tsuruta
    • Journal Title

      Proceedings of Symposium on Ultrasonic Electronics (USE2022)

      Volume: 43

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] Design of topological phononic structure for multi mode propagation2021

    • Author(s)
      Hiroaki Takeshita , Masaaki Misawa , and Kenji Tsuruta
    • Journal Title

      Proceedings of Symposium on Ultrasonic Electronics (USE2021)

      Volume: 42

    • Related Report
      2021 Research-status Report
    • Open Access
  • [Presentation] カゴメ格子積層型の3次元フォノニック結晶における高次トポロジカルヒンジモード2023

    • Author(s)
      秦 佑介,三澤 賢明,鶴田 健二
    • Organizer
      第70回応用物理学会春季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 音響メタマテリアル/トポロジカルフォノニクス:音波・弾性波制御への物性科学的アプローチ2023

    • Author(s)
      鶴田 健二
    • Organizer
      第61回日本セラミックス協会セラミックス基礎科学討論
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Multitimescale time-resolved electron diffraction measurements for nanocarbon materials2023

    • Author(s)
      Masaki Hada
    • Organizer
      第64回フラーレン・ナノチューブ・グラフェン総合シンポジウム
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Metamaterial and Topological Physics Approaches for Designing Efficient Acoustic/Elastic Devices2022

    • Author(s)
      Kenji Tsuruta
    • Organizer
      The 43rd Symposium on Ultrasonic Electronics (USE 2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Reconfigurable Waveguide Design in Valley-Topological Phononic Crystal2022

    • Author(s)
      Md. Shuzon Ali, Motoki Kataoka, Masaaki Misawa, Kenji Tsuruta
    • Organizer
      The 43rd Symposium on Ultrasonic Electronics (USE 2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Higher-order Band Control and Topological Elastic Waveguide Design using Resonant-type Phononic Crystals2022

    • Author(s)
      Yuito Ohashi, Motoki Kataoka, Hiroaki Takeshita, Masaaki Misawa, Kenji Tsuruta
    • Organizer
      The 43rd Symposium on Ultrasonic Electronics (USE 2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Design of Topological Phononic Structure and Application to Thin Plate Elastic Wave2022

    • Author(s)
      Motoki Kataoka, Yuito Ohashi, Masaaki Misawa, Kenji Tsuruta
    • Organizer
      The 43rd Symposium on Ultrasonic Electronics (USE 2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Properties of liquid Fe-O-Light-Element ternary systems under high pressure : molecular dynamics simulations2022

    • Author(s)
      Satoshi Ohmura
    • Organizer
      International Conference on High Energy Density Sciences 2022 (HEDS2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Bonding and structure of liquid iron-light-element-oxygen ternary alloys under high pressure: molecular dynamics simulations2022

    • Author(s)
      Satoshi Ohmura
    • Organizer
      The 18th International Conference on Liquid and Amorphous Metals
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 極超音波バレー型トポロジカルフォノニック結晶2022

    • Author(s)
      畑中 大樹,竹下 弘朗,片岡 源樹,三澤 賢明,岡本 創,山口 浩司,鶴田 健二
    • Organizer
      第83回応用物理学会秋季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 欠損付Y形楕円構造トポロジカルフォノニック結晶を用いた音響導波路設計2022

    • Author(s)
      大橋 唯人,片岡 源樹,竹下 弘明,三澤 賢明,鶴田 健二
    • Organizer
      第83回応用物理学会秋季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 超高速時間分解構造ダイナミクス計測のナノカーボン材料への展開2022

    • Author(s)
      羽田 真毅
    • Organizer
      第11回フラーレン・ナノチューブ・グラフェン若手研究会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 超高速時間分解電子線回折法を用いた炭素材料の構造ダイナミクス計測2022

    • Author(s)
      羽田 真毅
    • Organizer
      第59回炭素材料夏季セミナー
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] カーボンナノチューブ・窒化ホウ素ナノチューブヘテロ接合に生じる超高速エネルギー移動2022

    • Author(s)
      四方諒、岸淵美咲、矢嶋渉、鈴木弘朗、大村訓史、林靖彦、羽田真毅
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Research-status Report
  • [Presentation] C3v対称性をもつトポロジカルフォノニック結晶による 弾性波導波路の構造設計2021

    • Author(s)
      竹下 弘朗、三澤 賢明、鶴田 健二
    • Organizer
      第82回応用物理学会秋季学術講演会
    • Related Report
      2021 Research-status Report
  • [Presentation] Design of topological phononic structure for multi mode propagation2021

    • Author(s)
      Hiroaki Takeshita , Masaaki Misawa , Kenji Tsuruta
    • Organizer
      The 42nd Symposium on Ultrasonics Electronics
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Remarks] 岡山大学 学術研究院 自然科学学域 マルチスケールデバイス設計学研究室ホームページ

    • URL

      http://www.cc.okayama-u.ac.jp/~eng_mdd/

    • Related Report
      2022 Annual Research Report
  • [Remarks] Multiscale Device Design Laboratory: NEWS

    • URL

      http://www.cc.okayama-u.ac.jp/~eng_mdd/

    • Related Report
      2021 Research-status Report

URL: 

Published: 2021-07-13   Modified: 2024-01-30  

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