Books 【 display / non-display 】

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

  　More details

  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

  　More details

  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 ）

  　More details

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

Thesis for a degree 【 display / non-display 】

Thesis for a degree 【 display / non-display 】

• Quantum Electrodynamics of Excitons with Radiative Relaxation

  Motoaki Bamba

  Osaka University   2009.3

  Doctoral Thesis   Single Work    [Reviewed]

  DOI

Papers 【 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

  　More details

  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

  　More details

  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

  　More details

  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

  　More details

  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

  　More details

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

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

display all >>

Review Papers 【 display / non-display 】

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

  　More details

  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 ErFeO₃. A superradiant phase transition by ultrastrong magnon–spin coupling has also been confirmed. The low-temperature phase transition in ErFeO₃ would be a key phenomenon bridging the thermal-equilibrium and non-equilibrium physics.</p><p>Magnon-mediated Dicke cooperativity has been observed in ErFeO₃. A superradiant phase transition by ultrastrong magnon–spin coupling has also been confirmed. The low-temperature phase transition in ErFeO₃ 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

  　More details

  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

  　More details

  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

  　More details

  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

  　More details

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

display all >>

Awards 【 display / non-display 】

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

display all >>

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

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

  　 More details

  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

  　 More details

  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

  　 More details

  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

  　 More details

  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

  　 More details

  Authorship：Coinvestigator(s)  Grant type：Competitive

display all >>

Other external funds procured 【 display / non-display 】

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

  　 More details

  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

  　 More details

  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

  　 More details

  Authorship：Coinvestigator(s) 

Presentations 【 display / non-display 】

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

  　More details

  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

  　More details

  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

  　More details

  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

  　More details

  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

  　More details

  Event date： 2024.9

  Language：Japanese   Presentation type：Poster presentation  

  Venue：北海道大学 札幌キャンパス  

display all >>

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

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

display all >>

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

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 】

Committee Memberships 【 display / non-display 】

• National Institute of Science and Technology Policy (NISTEP)

  2023.4  Science and Technology Expert

  　More details

  Committee type：Government 

• Japanese Association for the Advancement of Science (JAAS)

  2021.11  Board member

  　More details

  Committee type：Academic society 

• Japanese Association for the Advancement of Science (JAAS)

  2021.11 - 2022.7  President

  　More details

  Committee type：Academic society 

• The Preparation Committee of Japanese Association for Advancement of Science

  2020.11 - 2022.6  Chairperson

  　More details

  Committee type：Academic society 

• The Physical Society of Japan

  2017.4 - 2018.3  Committee in Division 5

  　More details

  Committee type：Academic society 

display all >>

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

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

  　More details

  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

  　More details

  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

  　More details

  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

  　More details

  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

  　More details

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

  Type：Internet

display all >>

Media Coverage 【 display / non-display 】

Media Coverage 【 display / non-display 】

• 理研、若手給与最大２割上げ 研究力向上へ人材獲得 正式発表、採用拡大、国内波及狙う

  日本経済新聞社  日本経済新聞  朝刊42ページ（社会・調査）  2023.1

  　More details

  Author：Other 

• （社説）科学を元気に 現状打破へ若手の挑戦

  朝日新聞社  朝日新聞  朝刊 オピニオン2  2022.7

  　More details

  Author：Other 

• 揺らぐ「科学技術立国」 不安定雇用の若手研究者が増加 参院選でも振興策が論点に

  中日新聞  東京新聞  夕刊 参院選2022  2022.7

  　More details

  Author：Other 

• 「科学技術立国」掲げるのに研究者の雇用不安定 「学生に勧められない」

  中日新聞  中日新聞  夕刊 一面  2022.7

  　More details

  Author：Other 

• 科学スコープ 日本の科学を元気にしたい 研究者らがＮＰＯ法人設立 馬場・京大特定准教授が代表理事 情報発信や政策提言も

  京都新聞社  京都新聞  夕刊2ページ（科学スコープ）  2022.7

  　More details

  Author：Other 

display all >>

Academic Activities 【 display / non-display 】

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

  　More details

  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

  　More details

  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

  　More details

  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

  　More details

  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

  　More details

  Type：Academic society, research group, etc. 

display all >>