BAMBA Motoaki

Affiliation

Faculty of Engineering, Division of Intelligent Systems Engineering

Job Title

Associate Professor

Research Fields, Keywords

Quantum squeezing, Microcavities, Excitons, Quantum electrodynamics, Polaritons, Quantum optics, Superradiance, Condensed matter photophysics, Semiconductors, Phase transitions, Superconducting circuits, Quantum computing, Laser, Superradiant phase transition, Thermodynamics of electromagnetic fields, Electromagnetism, Nonlinear optics

YNU Research Center

Research Center for Terahertz and Nano-optical sciences

Related SDGs




ORCID  https://orcid.org/0000-0001-9811-0416

Education 【 display / non-display

  • 2004.4
    -
    2009.3

    Osaka University   Department of Materials Engineering Science   Doctor Course   Completed

  • 2000.4
    -
    2004.3

    Osaka University   Department of Electronics and Materials Physics   Graduated

Degree 【 display / non-display

  • Doctor of Sience - Osaka University

Campus Career 【 display / non-display

  • 2023.4
     
     

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Intelligent Systems Engineering   Associate Professor  

  • 2023.4
     
     

    Concurrently   Yokohama National UniversityCollege of Engineering Science   Department of Mathematics, Physics, Electrical Engineering and Computer Science   Associate Professor  

  • 2023.4
     
     

    Concurrently   Yokohama National UniversityGraduate school of Engineering Science   Department of Mathematics, Physics, Electrical Engineering and Computer Science   Associate Professor  

External Career 【 display / non-display

  • 2021.1
     
     

    Kyoto University   Kyoto University Hakubi Researcher  

  • 2021.1
    -
    2023.3

    Kyoto University   Graduate School of Science   Collaborative Associate Professor  

  • 2021.1
    -
    2023.3

    Kyoto University   The Hakubi Center for Advanced Research   Program-Specific Associate Professor  

  • 2019.12
    -
    2023.3

    Kyoto University   International Research Unit of Quantum Information   Member  

  • 2019.4
    -
    2020.12

    Kyoto University   Graduate School of Science   Program-Specific Junior Associate Professor (JST PRESTO)  

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Academic Society Affiliations 【 display / non-display

Research Areas 【 display / non-display

  • Natural Science / Semiconductors, optical properties of condensed matter and atomic physics

  • Nanotechnology/Materials / Optical engineering and photon science

 

Books 【 display / non-display

  • Semiconductor quantum science and technology

    Nicolas Marquez Peraca, Andrey Baydin, Weilu Gao, Motoaki Bamba, Junichiro Kono( Role: Joint author ,  分担執筆, 範囲:Ultrastrong light–matter coupling in semiconductors)

    Elsevier  ( ISBN:9780128237731  [Reviewed]

    DOI CiNii

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    Total pages:472   Responsible for pages:89-151   Language:English Book type:Scholarly book

  • Ultrastrong light–matter coupling in semiconductors

    Nicolas Marquez Peraca and Andrey Baydin and Weilu Gao and Motoaki Bamba and Junichiro Kono( Role: Joint author)

    Elsevier  ( ISBN:9780128237731

    DOI

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    Language:English Book type:Scholarly book

  • 物性物理100問集

    問集出版プロジェクト 編, 木村剛, 小林研介, 田島節子( Role: Joint author ,  担当:共編者(共編著者))

    大阪大学出版会  ( ISBN:9784872595710

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    Total pages:158   Language:Japanese Book type:Textbook, survey, introduction

Thesis for a degree 【 display / non-display

Papers 【 display / non-display

  • Quantum simulation of an extended Dicke model with a magnetic solid

    Nicolas Marquez Peraca, Xinwei Li, Jaime M. Moya, Kenji Hayashida, Dasom Kim, Xiaoxuan Ma, Kelly J. … Show more authors

    Communications Materials   5 ( 1 )   42   2024.3  [Reviewed]

    DOI Web of Science arXiv

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Nature   Joint Work  

    The Dicke model describes the cooperative interaction of an ensemble of two-level atoms with a single-mode photonic field and exhibits a quantum phase transition as a function of light–matter coupling strength. Extending this model by incorporating short-range atom–atom interactions makes the problem intractable but is expected to produce new physical phenomena and phases. Here, we simulate such an extended Dicke model using a crystal of ErFeO3, where the role of atoms (photons) is played by Er3+ spins (Fe3+ magnons). Through terahertz spectroscopy and magnetocaloric effect measurements as a function of temperature and magnetic field, we demonstrated the existence of a novel atomically ordered phase in addition to the superradiant and normal phases that are expected from the standard Dicke model. Further, we elucidated the nature of the phase boundaries in the temperature–magnetic-field phase diagram, identifying both first-order and second-order phase transitions. These results lay the foundation for studying multiatomic quantum optics models using well-characterized many-body solid-state systems.

  • Perfect intrinsic squeezing at the superradiant phase transition critical point

    Kenji Hayashida and Takuma Makihara and Nicolas Marquez Peraca and Diego Fallas Padilla and Han Pu … Show more authors

    Scientific Reports   13 ( 1 )   2023.2  [Reviewed]

    DOI Web of Science PubMed

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    Authorship:Last author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media {LLC}   Single Work  

    <jats:title>Abstract</jats:title><jats:p>Some of the most exotic properties of the quantum vacuum are predicted in ultrastrongly coupled photon–atom systems; one such property is quantum squeezing leading to suppressed quantum fluctuations of photons and atoms. This squeezing is unique because (1) it is realized in the ground state of the system and does not require external driving, and (2) the squeezing can be perfect in the sense that quantum fluctuations of certain observables are completely suppressed. Specifically, we investigate the ground state of the Dicke model, which describes atoms collectively coupled to a single photonic mode, and we found that the photon–atom fluctuation vanishes at the onset of the superradiant phase transition in the thermodynamic limit of an infinite number of atoms. Moreover, when a finite number of atoms is considered, the variance of the fluctuation around the critical point asymptotically converges to zero, as the number of atoms is increased. In contrast to the squeezed states of flying photons obtained using standard generation protocols with external driving, the squeezing obtained in the ground state of the ultrastrongly coupled photon–atom systems is resilient against unpredictable noise.</jats:p>

  • Magnonic superradiant phase transition

    Bamba Motoaki, Li Xinwei, Peraca Nicolas Marquez, Kono Junichiro

    Communications Physics   5 ( 1 )   2022.1  [Reviewed]

    DOI Web of Science

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Joint Work  

  • Ultrastrong magnon-magnon coupling dominated by antiresonant interactions

    Makihara Takuma, Hayashida Kenji, Noe G. Timothy II, Li Xinwei, Peraca Nicolas Marquez, Ma Xiaoxuan … Show more authors

    NATURE COMMUNICATIONS   12 ( 1 )   2021.5  [Reviewed]

    DOI Web of Science PubMed arXiv

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media {LLC}   Joint Work  

    <jats:title>Abstract</jats:title><jats:p>Exotic quantum vacuum phenomena are predicted in cavity quantum electrodynamics systems with ultrastrong light-matter interactions. Their ground states are predicted to be vacuum squeezed states with suppressed quantum fluctuations owing to antiresonant terms in the Hamiltonian. However, such predictions have not been realized because antiresonant interactions are typically negligible compared to resonant interactions in light-matter systems. Here we report an unusual, ultrastrongly coupled matter-matter system of magnons that is analytically described by a unique Hamiltonian in which the relative importance of resonant and antiresonant interactions can be easily tuned and the latter can be made vastly dominant. We found a regime where vacuum Bloch-Siegert shifts, the hallmark of antiresonant interactions, greatly exceed analogous frequency shifts from resonant interactions. Further, we theoretically explored the system’s ground state and calculated up to 5.9 dB of quantum fluctuation suppression. These observations demonstrate that magnonic systems provide an ideal platform for exploring exotic quantum vacuum phenomena predicted in ultrastrongly coupled light-matter systems.</jats:p>

    Other Link: http://dx.doi.org/10.1038/s41467-021-23159-z

  • Observation of the magnonic Dicke superradiant phase transition

    Dasom Kim, Sohail Dasgupta, Xiaoxuan Ma, Joong-Mok Park, Hao-Tian Wei, Liang Luo, Jacques Doumani, … Show more authors

    Science Advances   11 ( 14 )   eadt1691   2025.4  [Reviewed]

    DOI

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    Language:English   Publishing type:Research paper (scientific journal)   Single Work  

    Other Link: https://arxiv.org/abs/2401.01873

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Review Papers 【 display / non-display

  • Thermal Photons and Non-Equilibrium Magnons

    Bamba Motoaki

    Butsuri   79 ( 2 )   63 - 67   2024.2  [Reviewed]  [Invited]

    DOI CiNii Research

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    Authorship:Lead author, Last author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:The Physical Society of Japan   Single Work  

    <p>Magnon-mediated Dicke cooperativity has been observed in ErFeO<sub>3</sub>. A superradiant phase transition by ultrastrong magnon–spin coupling has also been confirmed. The low-temperature phase transition in ErFeO<sub>3</sub> would be a key phenomenon bridging the thermal-equilibrium and non-equilibrium physics.</p><p>Magnon-mediated Dicke cooperativity has been observed in ErFeO<sub>3</sub>. A superradiant phase transition by ultrastrong magnon–spin coupling has also been confirmed. The low-temperature phase transition in ErFeO<sub>3</sub> would be a key phenomenon bridging the thermal-equilibrium and non-equilibrium physics.</p>

  • 「博士のすゝめ」とその向こう側

    馬場基彰

    化学   78 ( 8 )   11 - 11   2023.8

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    Authorship:Lead author, Last author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:岩波書店   Joint Work  

  • Our Voice and Our Ears-NPO for the Advancement of Science from Japan

    BAMBA Motoaki

    Butsuri   78 ( 3 )   152 - 153   2023.3  [Reviewed]  [Invited]

    DOI

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    Authorship:Lead author, Last author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:The Physical Society of Japan   Single Work  

    Other Link: http://hdl.handle.net/2433/279807

  • Quantum Simulation of an Extended Dicke Model with a Magnetic Solid

    Nicolas Marquez Peraca, Xinwei Li, Jaime M. Moya, Kenji Hayashida, Xiaoxuan Ma, Kelly J. Neubauer, … Show more authors

    arXiv   2023.2

    DOI arXiv

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    Authorship:Corresponding author   Language:English   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:arXiv   Joint Work  

  • 日本科学振興協会の設立

    春日匠, 馬場基彰

    科学   92 ( 5 )   398 - 400   2022.5

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    Authorship:Last author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:岩波書店   Joint Work  

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Awards 【 display / non-display

  • Top Peer Reviewer 2019, Top 1% of reviewers in Physics

    2019.9   Web of Science  

    Individual or group name of awards:Motoaki BAMBA

  • Publons Peer Review Awards 2018, Top 1% of reviewers in Physics

    2018.9   Web of Science  

    Individual or group name of awards:Motoaki BAMBA

  • Research Award

    2018.2   Research Foundation for Opto-Science and Technology  

    Individual or group name of awards:BAMBA Motoaki

  • 11th Young Scientist Award of the Physical Society of Japan (Division 5: Optical Properties of Condensed Matter)

    2017.3   The Physical Society of Japan   Superposition of light in free space and localized matters

    Individual or group name of awards:BAMBA Motoaki

  • 11th Young Scientist Award of the Physical Society of Japan (Division 1: Atomic and Molecular physics, Quantum Electronics, Radiation)

    2017.3   The Physical Society of Japan   Theoretical studies on the ultrastrong light matter coupling

    Individual or group name of awards:BAMBA Motoaki

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Grant-in-Aid for Scientific Research 【 display / non-display

  • Development of cavity structures that enhance the magnetic-field vacuum fluctuations for realizing the superradiant phase transition

    Grant number:25K01691  2025.4 - 2028.3

    Japan Society for the Promotion of Science (JSPS)  Grants-in-Aid for Scientific Research - KAKENHI -  Grant-in-Aid for Scientific Research(B)

    Investigator(s):Motoaki BAMBA

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    Authorship:Principal investigator  Grant type:Competitive

  • Thermal-equilibrium quantum squeezing by superradiant phase transition: For its observation

    Grant number:24K21526  2024.6 - 2027.3

    Japan Society for the Promotion of Science (JSPS)  Grants-in-Aid for Scientific Research - KAKENHI -  Grant-in-Aid for Challenging Research (Exploratory)

    Investigator(s):Motoaki BAMBA

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    Authorship:Principal investigator  Grant type:Competitive

  • ピコ秒ランダムテレグラフノイズの外場制御に向けた,磁場中超高速揺らぎ分光法の開発

    Grant number:25K00012  2025.4 - 2028.3

    日本学術振興会  科学研究費助成事業  Grant-in-Aid for Scientific Research(B)

    Investigator(s):栗原貴之

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    Authorship:Coinvestigator(s)  Grant type:Competitive

    近年,確率的な物理現象を用いた新しい情報処理の観点から,古典的なスピン系が二つの準安定状態の間を確率的にスイッチングすることで生じる「ランダムテレグラフノイズ(RTN)」を高速に示すような物質系の探索が活発化している。
    申請者はこれまでの研究で,「フェムト秒ノイズ相関分光法」というユニークな計測手法を開発し,スピンの熱揺らぎダイナミクスをフェムト秒時間分解能で観測することに世界に先駆けて成功した。その結果,Sm0.7Er0.3FeO3のスピン再配列転移温度近傍において発現する二重井戸型の磁気ポテンシャル中において,数10psの時間スケールでRTNが生じていることを初めて明らかにした。
    本研究ではこの成果を発展させ,応用上重要な要素である,超高速RTNの「外場制御」を目指す。このために,FemNoc手法の高感度化と,磁場印加のための装置構築に取り組む。

  • 共振器-量子物質結合系の観測に向けたテラヘルツ電場ゆらぎ顕微鏡の開発

    Grant number:25K01694  2025.4 - 2028.3

    日本学術振興会  科学研究費助成事業  Grant-in-Aid for Scientific Research(B)

    Investigator(s):内田健人

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    Authorship:Coinvestigator(s)  Grant type:Competitive

  • Macroscopic quantum theory for quantum condensations in non-equilibrium composite systems

    Grant number:26287087  2014.4 - 2018.3

    JSPS  Grant-in-Aid for Scientific Research(B)

    Investigator(s):OGAWA Tetsuo

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    Authorship:Coinvestigator(s)  Grant type:Competitive

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Other external funds procured 【 display / non-display

  • 熱平衡下で量子スクイージングを示す物質の探索と設計

    2025.1 - 2026.12

    Private Foundations  光科学技術研究振興財団研究助成事業

    Investigator(s):馬場基彰

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    Authorship:Principal investigator 

    熱平衡下の量子スクイージング(量子ゆらぎの抑制)の世界初観測を目指して,本研究では,その観測に最適な物質の探索と設計を理論的に実施する.
    量子スクイージングはレーザー光と非線形光学結晶などを用いた非平衡ダイナミックスによって生成され,観測手法も確立され,現在の量子科学技術の基盤となっている.しかし,非平衡下の量子スクイージングはデコヒーレンス(ノイズ)によって容易に減退してしまう.一方,熱平衡下の量子スクイージングは系の最も安定な状態で得られることから,いかなるデコヒーレンスに対しても堅牢であり,非平衡ダイナミクスに基づいて発展してきた量子科学技術を大きく変革・転換させ,これまでに比べて根本的に安定な量子科学技術の基盤となる潜在性を有している.しかしながら,熱平衡下の量子スクイージングはいまだ実験的に観測された例がない.
    現在,研究協力者らと共に,京都大学およびアメリカRice大学において,量子ゆらぎの測定装置を構築中である.それらと並行して,熱平衡下の量子スクイージングを観測するために最も適した物質を本研究によって理論的に探索・設計することで,熱平衡下の量子スクイージングの世界初観測を試みる.

  • Phase transition of environment for overcoming the trade-off between controlling and protecting quantum states

    Grant number:JPMJPR1767  2017.10 - 2021.3

    Japan Science and Technology Agency  Precursory Research for Embryonic Science and Technology (PRESTO)

    Investigator(s):BAMBA Motoaki

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    Authorship:Principal investigator 

    In order to push the frontier of quantum technologies into the real societies, we try to establish a strategy for overcoming the trade-off between controlling and protecting quantum states. In contrast to the conventional way relying on the suppression of decoherence sources in fabrication processes, we artificially cause a phase transition of environment incorporating the decoherence sources, which are expected to be pinned by a spontaneously appeared field and an engineered energy gap in the environment, while keeping quantum-bits unchanged.

  • Japan-US Network for Clean Energy Technologies Involving Oriented Nanotubes (JUNCTION)

    Grant number:JPJSJRP2022120  2023.1 - 2025.12

    Ministry of Education, Culture, Sports, Science and Technology  JSPS-NSF Partnerships for International Research and Education (PIRE Program)

    Investigator(s):Kazuhiro Yanagi

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    Authorship:Coinvestigator(s) 

Presentations 【 display / non-display

  • 光と物質の超強結合と超放射相転移

    馬場基彰  [Invited]

    第9回フォトニクスワークショップ「光で探る多彩な未来図!」  2024.11  応用物理学会フォトニクス分科会

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    Event date: 2024.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:沖縄県青年会館  

  • 平衡光量子性の最前線

    馬場基彰  [Invited]

    非平衡固体物性の最前線2024  2024.11  辻直人, 高吉慎太郎, 村上雄太, 鈴木剛, 内田健人

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    Event date: 2024.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:京都大学 北部キャンパス 理学研究科セミナーハウス  

  • 17aPS-45 Strained Ge量子井戸による超放射相転移の発現可能性について

    中尾太一, 馬場基彰

    日本物理学会第79回年次大会  2024.9  日本物理学会

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    Event date: 2024.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:北海道大学 札幌キャンパス  

  • 17aPS-48 超強結合下の Dicke モデルにおけるレーザー発振と超放射相転移

    平田祐樹, 馬場基彰

    日本物理学会第79回年次大会  2024.9  日本物理学会

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    Event date: 2024.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:北海道大学 札幌キャンパス  

  • 17aPS-69 固体中サブテラヘルツゆらぎの時間相関測定系の構築

    古川貴也, 内田健人, 栗原貴之, 馬場基彰, 田中耕一郎

    日本物理学会第79回年次大会  2024.9  日本物理学会

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    Event date: 2024.9

    Language:Japanese   Presentation type:Poster presentation  

    Venue:北海道大学 札幌キャンパス  

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Charge of on-campus class subject 【 display / non-display

  • 2025   Introduction to Light-Matter Interaction Ⅱ

    Interfaculty Graduate School of Innovative and Practical Studies

  • 2025   Introduction to Light-Matter Interaction Ⅰ

    Interfaculty Graduate School of Innovative and Practical Studies

  • 2025   Advanced Theory of Light-Matter Interaction

    Graduate school of Engineering Science

  • 2025   Introduction to Light-Matter Interaction

    Graduate school of Engineering Science

  • 2025   Current Topics in Physics Frontier

    Graduate school of Engineering Science

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Charge of off-campus class subject 【 display / non-display

  • 物性物理学入門

    2015.4 - 2019.9 Institution:大阪大学

 

Committee Memberships 【 display / non-display

  • National Institute of Science and Technology Policy (NISTEP)

    2023.4  Science and Technology Expert

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    Committee type:Government 

  • Japanese Association for the Advancement of Science (JAAS)

    2021.11  Board member

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    Committee type:Academic society 

  • Japanese Association for the Advancement of Science (JAAS)

    2021.11 - 2022.7  President

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    Committee type:Academic society 

  • The Preparation Committee of Japanese Association for Advancement of Science

    2020.11 - 2022.6  Chairperson

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    Committee type:Academic society 

  • The Physical Society of Japan

    2017.4 - 2018.3  Committee in Division 5

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    Committee type:Academic society 

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Social Contribution(Extension lecture) 【 display / non-display

  • 【越境トーク】産休育休中の科研費の実施

    Role(s): Planner, Logistic support, Report author

    NPO法人 日本科学振興協会  オンライン  2025.3

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    Audience: Researchers, Government agency, Other

    Type:Lecture

  • 第14回 科学の甲子園 神奈川県大会

    Role(s): Commentator

    神奈川県教育委員会  神奈川県立総合教育センター  2024.12

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    Audience: High school students, Teachers

    Type:Seminar, workshop

  • 親子実験ワーク「オリジナル香水をつくろう!」

    Role(s): Planner, Logistic support, Report author

    学生サイエンスコミュニティCurioSeeds、NPO法人 日本科学振興協会(JAAS)  へそ祭り(2024年)  神奈川県横浜市西区中央2-13-2 藤棚デパートメント  2024.11

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    Audience: Infants, Schoolchildren, Parents/Guardians

    Type:Science cafe

  • GENSEKI 2022 The Final

    Role(s): Commentator

    学生団体BEAST  GENSEKI 2022  日本科学未来館  2023.2

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    Audience: Schoolchildren, Junior high school students, High school students, University students, Graduate students, Teachers, Parents/Guardians, Researchers, General public, Company

    Type:Seminar, workshop

  • 【京大准教授が語る】「光相転移」の魅力とは!?気になるヨーロッパの研究環境も紹介!(馬場基彰先生)- 第2回突撃隣の研究室!

    Role(s): Guest

    学生コミュニティミツバチ  突撃隣の研究室!  YouTube  2021.12

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    Audience: Schoolchildren, Junior high school students, High school students, University students, Graduate students, Teachers, Parents/Guardians

    Type:Internet

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Media Coverage 【 display / non-display

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Academic Activities 【 display / non-display

  • The International Workshop on Quantum Vacuum in Matter

    Role(s): Planning, management, etc.

    Hanyu Zhu  ( Rice University, Houston, TX, USA ) 2023.10

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    Type:Academic society, research group, etc. 

    Rice University, Houston, TX, USA

  • 第31回光物性研究会

    Role(s): Planning, management, etc.

    光物性研究会  ( Zoom ) 2020.12

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    Type:Academic society, research group, etc. 

  • 第23回光科学若手研究会

    Role(s): Planning, management, etc.

    光科学若手研究会  ( 大阪府立大学 I-site なんば ) 2019.11

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    Type:Academic society, research group, etc. 

  • 応用物理学会 量子エレクトロニクス研究会「光操作の最前線」

    Role(s): Planning, management, etc.

    応用物理学会 量子エレクトロニクス研究会  ( 上智大学軽井沢セミナーハウス ) 2017.4

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    Type:Academic society, research group, etc. 

  • 第16回光科学若手研究会

    Role(s): Planning, management, etc.

    光科学若手研究会  ( 立命館大学 大阪茨木キャンパス ) 2016.4

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    Type:Academic society, research group, etc. 

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