Researcher basic information

• Doctor of Science, Kyoto University, Mar. 2021

• https://researchmap.jp/hikaru_watanabe?lang=en

• https://orcid.org/0000-0001-7329-9638
• https://jglobal.jst.go.jp/detail?JGLOBAL_ID=202201004026491041

• 10914624

• https://orcid.org/0000-0001-7329-9638

• 202201004026491041

• 多極子
• 反強磁性伝導系

• Natural Science, Magnetism, superconductivity and strongly correlated systems

Research activity information

• Oct. 2020, 日本物理学会, 日本物理学会 学生優秀発表賞（領域４）
• Mar. 2016, 大阪大学理学部, 理学部賞

• Dual-Circular Raman Optical Activity of Axial Multipolar Order
  Hikaru Watanabe; Rikuto Oiwa; Hitoshi Mori; Ryotaro Arita
  Physical Review Letters, 29 Jul. 2026, [Peer-reviewed], [Lead author, Corresponding author]
  Scientific journal, 46035033;50050592;44424818
• Raman Optical Activity Induced by Ferroaxial Order in NiTiO3
  Gakuto Kusuno; Takeshi Hayashida; Takayuki Nagai; Hikaru Watanabe; Rikuto Oiwa; Tsuyoshi Kimura; Takuya Satoh
  Physical Review Letters, 19 May 2026, [Peer-reviewed]
  Scientific journal, 46035033;50050592;44424818
• Evidence for Itinerant Ferromagnetic Flat Bands Producing Large Transverse Responses
  Susumu Minami; Yangming Wang; Seigo Souma; Hiroto Nakamura; Akito Sakai; Takumi Osumi; Hang Su; Hikaru Watanabe; Shun'ichiro Kurosawa; Rikuto Oiwa; Daisuke Nishio‐Hamane; Kosuke Nakayama; Takuya Nomoto; Ryotaro Arita; Takafumi Sato; Satoru Nakatsuji
  Advanced Materials, 27 Apr. 2026, [Peer-reviewed]
  English, Scientific journal, ABSTRACT
  Interference of electronic wavefunctions may result in the emergence of a flat band, and trigger nontrivial correlated phenomena and phase formations when the flat band crosses the Fermi energy . To date, such an itinerant flat band at has been reported for electronic states without symmetry breaking. If a flat band arises at even with broken symmetry, the ordered state may offer a distinct platform for studying novel phases and spontaneous responses. Here we report experimental and theoretical evidence for itinerant ferromagnetic flat bands formed by spin‐polarized ‐electron orbitals on a stacked honeycomb–kagome lattice, hosting the alternating stack of honeycomb and kagome sublattices. Our theory together with angle‐resolved photoemission spectroscopy and magneto–thermoelectric measurements finds multiple topological flat bands at generating large Berry curvature in the ferrimagnet below its Curie temperature of 940 K. We observe large transverse responses, in particular, gigantic anomalous Nernst effect producing the largest transverse thermoelectric conductivity over 10 A at room temperature. Our study paves a path for developing itinerant magnetic flat bands and to their spintronic and thermoelectric applications.
• Quantum geometry in low-energy linear and nonlinear optical responses of the magnetic Rashba semiconductor (Ge,Mn)Te
  Tsubasa Takagi; Hikaru Watanabe; Ryutaro Yoshimi; Yuki Sato; Shingo Toyoda; Atsushi Tsukazaki; Kei S. Takahashi; Masashi Kawasaki; Yoshinori Tokura; Naoki Ogawa
  Physical Review B, 10 Mar. 2026, [Peer-reviewed]
  Scientific journal, 46035033;50050592;44424818
• Dirac Charge in Antiferromagnetic Topological Semimetals
  Kohei Hattori; Hikaru Watanabe; Ryotaro Arita
  Physical Review Letters, 30 Jan. 2026, [Peer-reviewed], [Corresponding author]
  Scientific journal, 46035033;44424818;50050592
• Symmetry, microscopy and spectroscopy signatures of altermagnetism
  Tomas Jungwirth; Jairo Sinova; Rafael M. Fernandes; Qihang Liu; Hikaru Watanabe; Shuichi Murakami; Satoru Nakatsuji; Libor Šmejkal
  Nature, 22 Jan. 2026, [Peer-reviewed]
  English, Scientific journal
• Realization of a two-dimensional d -wave altermagnet in La2O3Mn2Se2
  Shinichiro Asai; Junxi Hu; Zheyuan Liu; Shinichi Itoh; Daichi Ueta; Jin Matsuda; Tatsuto Hatanaka; Hikaru Watanabe; Ryotaro Arita; Takatsugu Masuda
  Physical Review Materials, 07 Jan. 2026, [Peer-reviewed]
  Scientific journal, 46035033;50050592;44424818
• Transport evidence of current-induced nematic Dirac valleys in a parity-time-symmetric antiferromagnet
  Hideaki Sakai; Yuya Miyamoto; Motoi Kimata; Hikaru Watanabe; Yoichi Yanase; Masayuki Ochi; Masaki Kondo; Hiroshi Murakawa; Noriaki Hanasaki
  Nature Communications, 07 Jan. 2026, [Peer-reviewed]
  Scientific journal, 46035033;50050592;44424818
• Scaling‐dependent tunability of spin‐driven photocurrents in magnetic metamaterials
  Gabriele Cavanna; Hidehisa Taketani; Hikaru Watanabe; Da Pan; Anna Honda; Daiki Oshima; Takeshi Kato; Masakazu Matsubara
  Nanophotonics, 22 Dec. 2025, [Peer-reviewed]
  Scientific journal
• Symmetry analysis of cross-circular and parallel-circular Raman optical activity
  Hikaru Watanabe; Rikuto Oiwa; Gakuto Kusuno; Takuya Satoh; Ryotaro Arita
  Physical Review B, 02 Sep. 2025, [Peer-reviewed], [Lead author, Corresponding author]
  Scientific journal, 46035033;50050592;44424818
• Multiferroic Collinear Antiferromagnets with Hidden Altermagnetic Spin Splitting
  Jin Matsuda; Hikaru Watanabe; Ryotaro Arita
  Physical Review Letters, 134, 22, American Physical Society (APS), 05 Jun. 2025, [Peer-reviewed], [Corresponding author]
  Scientific journal, 46035033;50050592;44424818
• Nonlinear Hall effect driven by spin-charge-coupled motive force
  Kohei Hattori; Hikaru Watanabe; Ryotaro Arita
  Physical Review B, 111, 17, American Physical Society (APS), 12 May 2025, [Peer-reviewed]
  Scientific journal, 46035033;44424818;50050592
• Gapped nodal planes and large topological Nernst effect in the chiral lattice antiferromagnet CoNb3S6
  Nguyen Duy Khanh; Susumu Minami; Moritz M. Hirschmann; Takuya Nomoto; Ming-Chun Jiang; Rinsuke Yamada; Niclas Heinsdorf; Daiki Yamaguchi; Yudai Hayashi; Yoshihiro Okamura; Hikaru Watanabe; Guang-Yu Guo; Youtarou Takahashi; Shinichiro Seki; Yasujiro Taguchi; Yoshinori Tokura; Ryotaro Arita; Max Hirschberger
  Nature Communications, 16, 1, Springer Science and Business Media LLC, 26 Mar. 2025, [Peer-reviewed]
  Scientific journal
• Nonlinear optical response in superconductors in magnetic field: Quantum geometry and topological superconductivity
  Hiroto Tanaka; Hikaru Watanabe; Youichi Yanase
  Physical Review B, 110, 1, American Physical Society (APS), 30 Jul. 2024, [Peer-reviewed]
  Scientific journal
• Effect of collective spin excitations on electronic transport in topological spin textures
  Kohei Hattori; Hikaru Watanabe; Junta Iguchi; Takuya Nomoto; Ryotaro Arita
  Physical Review B, 16 Jul. 2024, [Peer-reviewed], [Corresponding author]
  Scientific journal
• Generalized Pitaevskii relation between rectifying and linear responses: Application to reciprocal magnetization induction
  Hikaru Watanabe; Akito Daido
  Physical Review B, 110, 1, American Physical Society (APS), 02 Jul. 2024, [Peer-reviewed], [Lead author, Corresponding author]
  Scientific journal
• Magnetic parity violation and parity-time-reversal-symmetric magnets
  Hikaru Watanabe; Youichi Yanase
  Journal of Physics: Condensed Matter, 36, 37, 373001, 373001, IOP Publishing, 19 Jun. 2024, [Peer-reviewed], [Invited], [Lead author, Corresponding author]
  Scientific journal, Abstract
  
  Parity-time-reversal symmetry ( symmetry), a symmetry for the combined operations of space inversion ( ) and time reversal ( ), is a fundamental concept of physics and characterizes the functionality of materials as well as and symmetries. In particular, the -symmetric systems can be found in the centrosymmetric crystals undergoing the parity-violating magnetic order which we call the odd-parity magnetic multipole order. While this spontaneous order leaves symmetry intact, the simultaneous violation of and symmetries gives rise to various emergent responses that are qualitatively different from those allowed by the nonmagnetic -symmetry breaking or by the ferromagnetic order. In this review, we introduce candidates hosting the intriguing spontaneous order and overview the characteristic physical responses. Various off-diagonal and/or nonreciprocal responses are identified, which are closely related to the unusual electronic structures such as hidden spin-momentum locking and asymmetric band dispersion.
• Symmetry analysis with spin crystallographic groups: Disentangling effects free of spin-orbit coupling in emergent electromagnetism
  Hikaru Watanabe; Kohei Shinohara; Takuya Nomoto; Atsushi Togo; Ryotaro Arita
  Physical Review B, 109, 9, American Physical Society (APS), 28 Mar. 2024, [Peer-reviewed], [Lead author, Corresponding author]
  Scientific journal
• Bulk photovoltaic effect in antiferromagnet: Role of collective spin dynamics
  Junta Iguchi; Hikaru Watanabe; Yuta Murakami; Takuya Nomoto; Ryotaro Arita
  Physical Review B, 109, 6, American Physical Society (APS), 06 Feb. 2024, [Peer-reviewed], [Corresponding author]
  Scientific journal
• Algorithm for spin symmetry operation search
  Kohei Shinohara; Atsushi Togo; Hikaru Watanabe; Takuya Nomoto; Isao Tanaka; Ryotaro Arita
  Acta Crystallographica Section A Foundations and Advances, 01 Jan. 2024, [Peer-reviewed]
  Scientific journal, A spin space group provides a suitable way of fully exploiting the symmetry of a spin arrangement with a negligible spin–orbit coupling. There has been a growing interest in applying spin symmetry analysis with the spin space group in the field of magnetism. However, there is no established algorithm to search for spin symmetry operations of the spin space group. This paper presents an exhaustive algorithm for determining the spin symmetry operations of commensurate spin arrangements. The present algorithm searches for spin symmetry operations from the symmetry operations of a corresponding nonmagnetic crystal structure and determines their spin-rotation parts by solving a Procrustes problem. An implementation is distributed under a permissive free software license in spinspg Version 0.1.1, available at https://github.com/spglib/spinspg.
• Nonlinear optical responses in noncentrosymmetric superconductors
  Hiroto Tanaka; Hikaru Watanabe; Youichi Yanase
  Physical Review B, 107, 2, American Physical Society (APS), 31 Jan. 2023, [Peer-reviewed]
  Scientific journal
• Emergent Magnetomultipoles and Nonlinear Responses of a Magnetic Hopfion
  Yizhou Liu; Hikaru Watanabe; Naoto Nagaosa
  Physical Review Letters, 129, 26, American Physical Society (APS), 22 Dec. 2022, [Peer-reviewed]
  Scientific journal
• Effects of relaxation on the photovoltaic effect and possibility for photocurrent within the transparent region
  Yugo Onishi; Hikaru Watanabe; Takahiro Morimoto; Naoto Nagaosa
  Physical Review B, 106, 23, American Physical Society (APS), 07 Dec. 2022, [Peer-reviewed]
  Scientific journal
• Polarization-controlled tunable directional spin-driven photocurrents in a magnetic metamaterial with threefold rotational symmetry
  Masakazu Matsubara; Takatsugu Kobayashi; Hikaru Watanabe; Youichi Yanase; Satoshi Iwata; Takeshi Kato
  Nature Communications, 13, 1, Springer Science and Business Media {LLC}, 07 Nov. 2022, [Peer-reviewed]
  English, Scientific journal, AbstractFuture spintronics and quantum technologies will require a portfolio of techniques for manipulating electron spins in functional nanodevices. Especially, the establishment of the methods to control spin current is the key ingredient essential for the transfer and processing of information, enabling faster and low-energy operation. However, a universal method for manipulating spin currents with full-directional controllability and tunable magnitude has not been established. Here we show that an artificial material called a magnetic metamaterial (MM), which possesses a novel spintronic functionality not exhibited by the original substance, generates photo-driven ultrafast spin currents at room temperature via the magneto-photogalvanic effect. By tuning the polarization state of the excitation light, these spin currents can be directed with tunable magnitude along an arbitrary direction in the two-dimensional plane of the MM. This new concept may guide the design and creation of artificially engineered opto-spintronic functionalities beyond the limitations of conventional material science.
• Nonreciprocal Meissner response in parity-mixed superconductors
  Hikaru Watanabe; Akito Daido; Youichi Yanase
  Physical Review B, 105, 10, American Physical Society ({APS}), 17 Mar. 2022, [Peer-reviewed], [Lead author, Corresponding author]
  Scientific journal
• Nonreciprocal optical response in parity-breaking superconductors
  Hikaru Watanabe; Akito Daido; Youichi Yanase
  Physical Review B, 105, 2, American Physical Society ({APS}), 27 Jan. 2022, [Peer-reviewed], [Lead author]
  English, Scientific journal
• Superconducting piezoelectric effect
  Michiya Chazono; Hikaru Watanabe; Youichi Yanase
  Physical Review B, 105, 2, American Physical Society ({APS}), 12 Jan. 2022, [Peer-reviewed]
  English, Scientific journal
• Photocurrent response in parity-time symmetric current-ordered states
  Hikaru Watanabe; Youichi Yanase
  Physical Review B, 104, 2, American Physical Society ({APS}), 13 Jul. 2021, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
  English, Scientific journal
• Bond Directional Anapole Order in a Spin-Orbit Coupled Mott Insulator Sr2(Ir1−xRhx)O4
  H. Murayama; K. Ishida; R. Kurihara; T. Ono; Y. Sato; Y. Kasahara; H. Watanabe; Y. Yanase; G. Cao; Y. Mizukami; T. Shibauchi; Y. Matsuda; S. Kasahara
  Physical Review X, 11, 1, American Physical Society ({APS}), 02 Feb. 2021, [Peer-reviewed]
  English, Scientific journal
• Chiral Photocurrent in Parity-Violating Magnet and Enhanced Response in Topological Antiferromagnet
  Hikaru Watanabe; Youichi Yanase
  Physical Review X, 11, 1, American Physical Society ({APS}), 04 Jan. 2021, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Nonlinear electric transport in odd-parity magnetic multipole systems: Application to Mn-based compounds
  Hikaru Watanabe; Youichi Yanase
  Physical Review Research, 2, 4, American Physical Society (APS), 15 Oct. 2020, [Peer-reviewed], [Lead author, Corresponding author]
  Scientific journal
• Enhanced magnetopiezoelectric effect at the Néel temperature in CaMn2Bi2
  Y. Shiomi; Y. Koike; N. Abe; H. Watanabe; T. Arima
  Physical Review B, 100, 5, American Physical Society ({APS}), 19 Aug. 2019, [Peer-reviewed]
  English, Scientific journal
• Observation of a Magnetopiezoelectric Effect in the Antiferromagnetic Metal EuMnBi2
  Y. Shiomi; H. Watanabe; H. Masuda; H. Takahashi; Y. Yanase; S. Ishiwata
  Physical Review Letters, 122, 12, American Physical Society ({APS}), 29 Mar. 2019, [Peer-reviewed]
  English, Scientific journal
• Symmetry analysis of current-induced switching of antiferromagnets
  Hikaru Watanabe; Youichi Yanase
  Physical Review B, 98, 22, American Physical Society ({APS}), 28 Dec. 2018, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal
• Group-theoretical classification of multipole order: Emergent responses and candidate materials
  Hikaru Watanabe; Youichi Yanase
  Physical Review B, 98, 24, American Physical Society (APS), 19 Dec. 2018, [Peer-reviewed], [Lead author, Corresponding author]
  Scientific journal
• Theory of orbital magnetic quadrupole moment and magnetoelectric susceptibility
  Atsuo Shitade; Hikaru Watanabe; Youichi Yanase
  Physical Review B, 98, 2, American Physical Society (APS), 16 Jul. 2018, [Peer-reviewed]
  Scientific journal
• Magnetic hexadecapole order and magnetopiezoelectric metal state in Ba1−xKxMn2As2
  Hikaru Watanabe; Youichi Yanase
  Physical Review B, 96, 6, American Physical Society ({APS}), 28 Aug. 2017, [Peer-reviewed], [Lead author, Corresponding author]
  English, Scientific journal

• スピン空間群による磁性体の創発的応答の解明
  渡邉 光; 野本 拓也; 有田 亮太郎, 日本物理学会誌, 80, 3, Mar. 2025, [Peer-reviewed], [Invited], [Lead author]
  Japanese, Introduction other
• Does the Ferroaxial Order Matter?
  Hikaru Watanabe, JPSJ News and Comments, 19, 29 Nov. 2022, [Invited]
  Physical Society of Japan, Introduction scientific journal
• Bond directional anapole order in Sr₂Ir_1-xRh_xO₄
  笠原成; 村山陽奈子; 石田浩祐; 栗原遼; 小野孝浩; 佐藤雄貴; 笠原裕一; 渡邉光; 柳瀬陽一; CAO G.; 水上雄太; 芝内孝禎; 松田祐司, 日本物理学会講演概要集(CD-ROM), 76, 1, 2021
• 奇パリティ多極子相の分類学と電磁応答・超伝導 (拡張多極子が拓くスピン軌道物性の新展開特集号)
  渡邉 光; 柳瀬 陽一; 石塚 淳; 金杉 翔太; 大同 暁人; 角田 峻太郎; 下出 敦夫; 塩見 雄毅, 固体物理, 55, 11, 535, 549, Nov. 2020, [Peer-reviewed], [Invited], [Lead author]
  Japanese
• Group-theoretical classification of multipolar system: application to order-induced responses
  Hikaru Watanabe; Youichi Yanase, J Physics ニュースレター, 6, 8, 12, Sep. 2018, [Invited]
  Japanese, Introduction other

• Spin-orbit-coupling-free orbital-symmetry violations in spin-ordered system
  Hikaru Watanabe
  Young Leaders Workshop on Frontier Quantum Matter, 07 Sep. 2026, English, Invited oral presentation
  07 Sep. 2026 - 11 Sep. 2026, [Invited]
• 磁性に誘起されるferroaxial性と創発応答
  渡邉 光
  若手カイラリティ研究会, 05 Aug. 2026, Japanese, Oral presentation
  04 Aug. 2026 - 07 Aug. 2026, 50050592
• 非従来型ラマン円偏光活性の理論
  渡邉 光
  第31回応用物理学コロキウム, 14 Apr. 2026, Japanese, Oral presentation
  14 Apr. 2026 - 14 Apr. 2026
• Versatile conventional antiferromagnets with hidden magnetic multipoles
  Hikaru Watanabe
  Altermagnetism and Unconventional Magnetic Orders in Quantum Materials, 31 Mar. 2026, English, Oral presentation
  29 Mar. 2026 - 03 Apr. 2026
• 磁性に誘起されるスピン運動量結合の電磁場による変調の理論
  渡邉 光; 野本 拓也; 有田 亮太郎
  日本物理学会2026年春季大会, 23 Mar. 2026, Japanese, Oral presentation
  23 Mar. 2026 - 26 Mar. 2026
• 交替磁性を含む磁性体の創発物性の理論：スピン空間群の活用について
  渡邉 光
  第98回スピントロニクス専門研究会「交代磁性スピントロニクス研究の現状と未来」, 13 Mar. 2026, Japanese, Invited oral presentation
  13 Mar. 2026 - 13 Mar. 2026, [Invited]
• Unconventional Raman optical activity
  Hikaru Watanabe
  The 24th Taiwan-Japan–Korea Symposium on Strongly Correlated Electron Systems, 05 Mar. 2026, English, Invited oral presentation
  05 Mar. 2026 - 07 Mar. 2026, [Invited]
• 種々の秩序系と創発非線形応答
  渡邉 光
  第十回「凝縮系理論の最前線」, 19 Feb. 2026, Japanese, Invited oral presentation
  17 Feb. 2026 - 19 Feb. 2026, [Invited]
• 近似的対称性を利用した物性の探索
  渡邉 光
  第４回「対相関と対凝縮 」研究会, 23 Jan. 2026, Japanese, Invited oral presentation
  21 Jan. 2026 - 23 Jan. 2026, [Invited]
• 軸性秩序系におけるラマン光学活性の理論
  渡邉 光
  山田研究会「量⼦液晶概念を基盤とした新奇物性科学の若⼿学際研究」, 18 Nov. 2025, Japanese, Invited oral presentation
  18 Nov. 2025 - 19 Nov. 2025, [Invited]
• バルク物質における種々の対称性の破れと光学応答
  渡邉 光
  メタマテリアルにおけるキメラ準粒⼦, 05 Nov. 2025, Japanese, Invited oral presentation
  05 Nov. 2025 - 06 Nov. 2025, [Invited]
• 軸性秩序に由来したラマン光学活性の理論
  渡邉 光; 大岩 陸人; 楠野 楽到; 佐藤 琢哉; 有田 亮太郎
  日本物理学会 第80回年次大会, 18 Sep. 2025, Japanese, Oral presentation
• Symmetry-wise disentanglement of spin and orbital degrees of freedom in physical phenomena
  Hikaru Watanabe
  The Workshop on Altermagnetism and School on Magnetic Symmetry, 23 Jun. 2025, English, Invited oral presentation
  23 Jun. 2025 - 26 Jun. 2025, [Invited]
• スピン結晶群によるマルチフェロイック磁性体の解析
  渡邉 光; 松田 仁; 有田 亮太郎
  日本物理学会 2025年春季大会, 18 Mar. 2025, Japanese, Oral presentation
• Spin crystallographic symmetry for classification of altermagnets and noncollinear magnets
  Hikaru Watanabe
  Brainstorming Workshop “Roadmap for Altermagnetism”, 09 Jan. 2025, English, Oral presentation
  08 Jan. 2025 - 10 Jan. 2025
• スピン結晶群の利用：磁性体の分類とさらなる創発応答の解明に向けて
  渡邉 光
  アシンメトリ量子のC02トピカルミーティング「アシンメトリ量子物質の開発：交差相関応答を求めて」, 06 Dec. 2024, Japanese, Invited oral presentation
  [Invited]
• Symmetry approach to spin-orbit-coupling-free responses in antiferromagnets
  Hikaru Watanabe
  Correlated Quantum Materials + beyond (Symposium for altermagnetism), 25 Nov. 2024, English, Invited oral presentation
  [Invited]
• Theory of complex magnets
  Hikaru Watanabe
  Workshop for altermagnets, 18 Nov. 2024, English, Invited oral presentation
  [Invited]
• ピタエフスキー関係式と逆電気磁気・自然二色性効果の理論
  渡邉 光; 大同 暁人
  日本物理学会 第79回年次大会, 16 Sep. 2024, Japanese, Oral presentation
• ピタエフスキー関係式の定式化とその応用
  渡邉 光
  東京工業大学 量子物理学・ナノサイエンス第395回セミナー, 23 Jul. 2024, Japanese, Public discourse
  [Invited]
• Symmetry analysis of altermagnetic and noncollinear magnets: disentangling spin and orbital degrees of freedom in physical phenomena
  Hikaru Watanabe
  International Conference on Magnetism 2024 (ICM2024), 04 Jul. 2024, English, Invited oral presentation
  [Invited], [International presentation]
• Pitaevskii relation bridging linear and rectification responses
  HIkaru Watanabe
  NQCM2024, 25 May 2024, English, Invited oral presentation
  [Invited], [International presentation]
• Symmetry of emergent physical phenomena free from relativistic spin-orbit coupling
  Hikaru Watanabe
  International Symposium on Quantum Electronics, 16 Feb. 2024, Oral presentation
  [International presentation]
• スピン結晶群に基づく創発応答の対称性解析
  渡邉 光
  東大駒場物性セミナー, 09 Feb. 2024, Invited oral presentation
  [Invited]
• スピン結晶群に基づく物性応答の理解
  渡邉 光
  若手理論交流研究会～物性研究における最近の進展, 21 Dec. 2023, Invited oral presentation
  [Invited]
• 物性応答に対するスピン軌道相互作用の役割：スピン群対称性の観点から
  渡邉 光; 篠原 航平; 野本 拓也; 東後 篤史; 有田 亮太郎
  日本物理学会第78 回年次大会, 17 Sep. 2023, Oral presentation
• 超伝導に由来した異常な非相反光学特性の理論
  渡邉 光
  強相関電子系のフロンティア, 20 Aug. 2023, Oral presentation
• Nonreciprocal property and resultant optical responses of superconductors
  Hikaru Watanabe
  Swiss-Japan alliance workshop: Trends in the Theory of Quantum Materials 2022 (TTQM2022), 02 Oct. 2022, Invited oral presentation
  [Invited], [International presentation]
• Nonreciprocal optical response in parity-breaking superconductors
  Hikaru Watanabe
  29th International Conference on Low Temperature Physics (LT29), 23 Aug. 2022, Poster presentation
  [International presentation]
• Magnetic photocurrent response assisted by quantum geometry in solid
  Hikaru Watanabe; Youichi Yanase; Naoto Nagaosa
  International Conference on Strongly Correlated Electron Systems (SCES2022), 24 Jul. 2022, English, Oral presentation
  [International presentation]
• 超伝導体における非線形光学応答
  渡邉 光
  SCTM2021「超伝導物質、トポロジカル物質」, 25 Nov. 2021, Oral presentation
• Circular photogalvanic effect in parity-time-inversion symmetric materials
  Hikaru Watanabe
  APW-RIKEN-Tsinghua-Kavli workshop: Highlights on condensed matter physics, 22 Oct. 2021, Poster presentation
  [International presentation]
• カレント秩序を示すイリジウム酸化物における非線形光学応答の理論
  渡邉 光; 柳瀬 陽一
  日本物理学会第77回秋季大会, 20 Sep. 2021, Oral presentation
• 磁性がもたらすスピン軌道結合構造と非線形伝導現象
  日本物理学会 第76 回年次大会, 13 Mar. 2021, Oral presentation
• Mn 系奇パリティ磁気多極子系が示す無磁場・磁場下における非線形電気伝導の理論研究
  渡邉 光; 柳瀬 陽一
  日本物理学会第76 回秋季大会, 10 Sep. 2020, Oral presentation
• 幾何的に非自明な電子状態の下で増強される新奇な光電流応答
  渡邉 光; 柳瀬 陽一
  日本物理学会 第 76 回秋季大会, 08 Sep. 2020
• 種々のパリティ破れに伴う光電流応答の分類と新しい光電流応答の提案
  渡邉 光; 柳瀬 陽一
  日本物理学会第76 回秋季大会, 08 Sep. 2020, Oral presentation
• 磁気的なパリティの破れに誘起される円偏光ガルバニック効果
  渡邉 光
  オンライン CMT (Condensed Matter Theory) セミナー, 17 Aug. 2020, Invited oral presentation
  [Invited]
• Mn 系奇パリティ磁気多極子秩序系における非線形伝導
  渡邉 光
  日本物理学会第 75 回年次大会, 16 Mar. 2020, Oral presentation
• Classification of multipole order and its application to transport phenomena in antiferromagnet
  Hikaru Watanabe
  Topomagnetism Is Coming: Relativity and Correlations in Topological Magnets, 2019, Invited oral presentation
  [Invited], [International presentation]
• Symmetry analysis of electrically-switchable antiferromagnets
  Hikaru Watanabe; Youichi Yanase
  Antiferromagnetic Spintronics: from topology to neuromorphic computing, 2019, Poster presentation
  [International presentation]
• Group-theoretical Classification of multipole ordered materials and its application to emergent responses
  Hikaru Watanabe; Youichi Yanase
  J-Physics 2019 International Conference & KINKEN-WAKATE 2019 Multipole Physics, 2019, Invited oral presentation
  [Invited], [International presentation]
• Current-induced nematicity in;odd-parity magnetic multipole system
  Hikaru Watanabe; Youichi Yanase
  CEMS Symposium on Emergent Quantum Materials, 2019, Poster presentation
  [International presentation]
• 電気磁気効果を用いたコリニア反強磁性のダイナミクスに関する理論的研究
  渡邉光、柳瀬陽一
  日本物理学会 第74 回秋季大会, 2019, Oral presentation
• Symmetry analysis of electrically-switchable antiferromagnets
  Hikaru Watanabe; Youichi Yanase
  International Symposium on Frontiers of Quantum Transport in Nano Science, 07 Nov. 2018, Poster presentation
  [International presentation]
• 多極子の分類と創発応答・ドメイン分類
  渡邉 光
  ETQ 研究会「多極子秩序と超伝導」, 08 Aug. 2018, Invited oral presentation
  [Invited]
• Symmetry analysis of electrical switching of antiferromagnets
  Hikaru Watanabe; Youichi Yanase
  International Conference on Magnetism 2018, 2018, Poster presentation
  [International presentation]
• Symmetry analysis of electrical switching of antiferromagnets
  Hikaru Watanabe; Youichi Yanase
  J-Physics 2018 Summer School, 2018, Poster presentation
  [International presentation]
• 反強磁性体の電気的制御に関する対称性からのアプローチ
  渡邉光、柳瀬陽一
  日本物理学会 第73 回秋季大会, 2018, Oral presentation
• 多極子秩序系の群論的分類
  渡邉 光; 柳瀬 陽一
  日本物理学会 第73 回年次大会, 2018, Oral presentation
• Classification of multipole order and its application to transport phenomena in antiferromagnet
  Hikaru Watanabe; Youichi Yanase
  Topomagnetism Is Coming: Relativity and Correlations in Topological Magnets, 2017, English, Invited oral presentation
  [Invited], [International presentation]
• Magnetic hexadecapole order and Magnetopiezoelectric metal state in K-doped BaMn2As2
  Hikaru Watanabe; Youichi Yanase
  Novel Quantum States in Condensed Matter 2017, 2017, Poster presentation
  [International presentation]
• Magnetic Hexadecapole Order in BaMn2As2
  Hikaru Watanabe; Youichi Yanase
  J-Physics 2017-International Workshop on Multipole Physics and Related Phenomena, 2017, Poster presentation
  [International presentation]
• Magnetic Hexadecapole Order in BaMn2As2
  Hikaru Watanabe, Youichi Yanase
  International Conference on Strongly Correlated Electron Systems (SCES2017), 2017, English, Poster presentation
  [International presentation]
• BaMn2As2が示す奇パリティ磁気多極子秩序
  渡邉 光; 柳瀬 陽一
  日本物理学会第 72 回年次大会, 2017, Oral presentation
• Magnetic hexadecapole order and Magnetopiezoelectric metal state in K-doped BaMn2As2
  Hikaru Watanabe; Youichi Yanase
  ETH-Amsterdam-Kyoto mini-workshop on multipole physics and ultrafast dynamics, 2016, English, Invited oral presentation
  [Invited], [International presentation]
• Mn 系奇パリティ磁気多極子
  渡邉 光
  J-Physics トピカルミーティング : 拡張多極子研究の進展と課題, Invited oral presentation
  [Invited]

• Sep. 2016 - Present
  日本物理学会

• 磁気構造探索と統合的物性スクリーニングによる機能反強磁性体設計
  科学研究費助成事業 基盤研究(B)
  Apr. 2024 - Mar. 2028
  野本拓也; 鈴木通人; 渡邉光
  日本学術振興会, 東京都立大学, 24K00581
• 磁気的なパリティの破れを持つ超伝導非一様系で発現する創発電磁現象の理論開拓
  科学研究費助成事業
  Apr. 2025 - Mar. 2027
  渡邉 光
  日本学術振興会, 学術変革領域研究(A), 東京大学, Principal investigator, 25H02115
• Theoretical study of photo-induced control and emergent itinerant responses in electrically-active antiferromagnets
  Grants-in-Aid for Scientific Research
  01 Apr. 2023 - 31 Mar. 2026
  渡邉 光
  Japan Society for the Promotion of Science, Grant-in-Aid for Early-Career Scientists, The University of Tokyo, 23K13058
• Multi-scale analysis of the photocurrent response and dynamic properties of antiferromagnets
  Grants-in-Aid for Scientific Research
  28 Apr. 2021 - 31 Mar. 2024
  渡邉 光
  本研究課題は反強磁性体等が示す磁気的なパリティの破れに着目し、その特徴的な物性の開拓を目指すものである。具体的には光・電気変換などの光物性応答の増強、あるいは複雑な磁気構造や磁性と他自由度の間の協奏により発現する新奇なダイナミクスの理論的解析を行う。
  本年度においては昨年度より進めている、トポロジカル絶縁体を用いた磁気的光電流応答の解析、および広い空間スケールにわたる物性現象における磁気的パリティの破れの効果の理論的検証を行った。前者についてはトポロジカル物質に特有の電子の量子幾何を利用したものである。特筆すべき点として、これまであまり着目されていない量子計量の物性応答における役割を明らかにしており、今後の実験的実証が期待される。後者について、共同研究などを主として、メタマテリアル磁性体におけるスイッチ可能な光電流応答の起源・非共鳴光による光電流応答生成の可能性・トポロジカルな磁気構造に創発される新奇な磁気多極子自由度などの解明をおこなった。これら現象はミクロ・メソ・セミマクロと複数の空間スケールにわたるものであるが、各現象は磁気秩序による対称性の破れ、あるいは保護された対称性によって統一的に理解できることから、磁気的パリティの破れを持つ系をキーワードとした広範な研究テーマへの展開を示唆しているといえる。さらに光・磁性が強くカップルした系についてもミクロな電子ハミルトニアンに立脚した計算を進めており、特に磁性ダイナミクスに由来して増強される光・電気物性を同定できた。
  Japan Society for the Promotion of Science, Grant-in-Aid for JSPS Fellows, The University of Tokyo, 21J00453
• Theoretical research of odd-parity multipole order and its fluctuation in itinerant electron systems
  Grants-in-Aid for Scientific Research
  25 Apr. 2018 - 31 Mar. 2021
  渡邉 光
  本課題は、物質を構成する電子の秩序、特に反転対称性を破る多極子自由度の秩序（奇パリティ多極子秩序）を持つ系に着目し、その物性応答を理論開拓するものである。これまでも数学的な手法による解析、具体的な物質を意識したモデル計算より、奇パリティ多極子秩序系に特有な応答を様々に明らかにすることができた。また本年度においても、これらの成果について、物性物理学分野においてポピュラーな雑誌、固体物理（アグネ社）の特集号へ寄稿する機会を得ることができた。しかしながら、これらは線形応答の範囲であって、より非線形応答における各多極子秩序の役割についてはいまだ明確な理解がなされていなかった。
  したがって、本年度においては特に静的電場あるいは光電場に駆動される電流応答（非線形伝導現象）の解析を主として行った。これらの応答は半導体ヘテロ接合にみられる整流応答と同様の現象であるため、本研究の遂行は、奇パリティ多極子の役割を調べるという基礎物理としての意義は勿論のこと、工学応用など他分野へ波及効果をも与えうるといえる。
  奇パリティ多極子秩序系においては特徴的な対称性が存在するが、これが線形応答と同様に非線形伝導現象の分類に際し、非常に強力なツールとなることを示すことができた。更には、磁性を持つ系、いわゆる奇パリティ磁気多極子秩序系に特有の電子構造に着目し、巨大非線形ホール応答や物質の不純物濃度に対して頑強な光電流応答などを理論的に提案した。これらはアメリカ物理学会の論文誌にて出版済みであり（２報）、招待講演を含めたいくつかの口頭講演にて発表も行っている（5件）。加えて実験研究との共同研究も行い論文として出版されたほか、これに刺激された理論研究も進み、論文として投稿段階にある。
  Japan Society for the Promotion of Science, Grant-in-Aid for JSPS Fellows, Kyoto University, 18J23115
• Magnetism, multipole order, and superconductivity in locally noncentrosymmetric crystals
  Grants-in-Aid for Scientific Research
  01 Apr. 2015 - 31 Mar. 2019
  Yanase Youichi; Peters Robert; Takashima Rina; Shiozaki Ken; Shitade Astuo; Ishizuka Jun; Takasan Kazuaki; Daido Akito; Sumita Shuntaro; Watanabe Hikaru; Kanasugi Shota; Hitomi Takanori; Nakamura Yasuharu
  Space inversion symmetry, namely parity, is a fundamental symmetry in physics. In the modern condensed matter physics, various phenomena arising from inversion symmetry breaking have attracted attention. In this research project we aimed further developments in this field. We revealed various phenomena in locally noncentrosymmetric materials where the global inversion symmetry is preserved while local inversion symmetry on atomic sites is violated. Examples are odd-parity multipole order and emergent electromagnetic responses, antiferromagnetic spintronics, and exotic superconductivity related to multipole order.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Kyoto University, 15K05164

• 若手カイラリティ研究会
  04 Aug. 2026 - 07 Aug. 2026
  Planning etc
  Academic society etc
  大岩 陸人, 角田 峻太郎, 渡邉 光
  50050592
• Novel Quantum Condensed Matter 2026 (NQCM2026)
  25 Apr. 2026 - 25 Apr. 2026
  Planning etc
  Academic society etc

• 固体物理（アグネ技術センター） 誌友
  Apr. 2026 - Present
  Informant, Planner
• 東京大学 駒場リサーチキャンパス公開イベント「計算物質科学への誘い」
  2023 - 2023
  Appearance, Planner, Organizing member
• 東京大学駒場リサーチキャンパス公開イベント 先端研若手シンポジウム
  2023 - 2023
  Editor, Planner, Organizing member

• 反強磁性体を電子液晶化ー東北大など実証
  Jan. 2026
  Other than myself
  株式会社日刊工業新聞社
  日刊工業新聞
  [Paper]
• 理研と東大、キラル磁性体CoNb3S6における自発ネルンスト効果の観測に成功
  Mar. 2025
  Other than myself
  日本経済新聞社
  日本経済新聞
  [Paper]

• May 2026
  プレスリリース：キラルでない結晶が"光の回転”を生む新原理を発見－従来の定説を覆す新しいラマン光学活性の起源を解明－
  https://www.isct.ac.jp/ja/news/ati2jkvlcrqd
  https://www.jst.go.jp/pr/announce/20260521/index.html
  https://www.t.u-tokyo.ac.jp/press/pr2026-05-21-001
  https://www.hokudai.ac.jp/news/pdf/260521_pr2.pdf
• Apr. 2026
  プレスリリース：フラットバンドが生む世界最大の横磁気熱電伝導率 ―磁気秩序下での遍歴フラットバンドを初めて実証―
  https://www.s.u-tokyo.ac.jp/ja/press/11128/
  https://www.t.kyoto-u.ac.jp/ja/research/topics/20260428
  https://www.tohoku.ac.jp/japanese/2026/04/press20260430-01-flat.html
  https://www.jst.go.jp/pr/announce/20260428/index.html
• Jan. 2026
  プレスリリース：反強磁性体で電流による電子の液晶化を実証 ―エレクトロニクス応用可能な電気抵抗変化として世界初観測―
  https://www.tohoku.ac.jp/japanese/2026/01/press20260108-01-Dirac.html
  https://www.sci.osaka-u.ac.jp/ja/topics/16226/
  https://www.jaea.go.jp/02/press2025/p26010701/
  https://www.kyoto-u.ac.jp/ja/research-news/2026-01-08-4
  https://www.s.u-tokyo.ac.jp/ja/press/11031/
• Mar. 2025
  プレスリリース：理研と東大、キラル磁性体CoNb3S6における自発ネルンスト効果の観測に成功
  https://www.riken.jp/press/2025/20250326_1/index.html
  https://www.jst.go.jp/pr/announce/20250326/index.html
  https://www.nikkei.com/article/DGXZRSP688905_W5A320C2000000/
• Nov. 2022
  プレスリリース：スピン流を光で完全に制御する新原理を開拓 超高速・高性能な光スピントロニクスデバイスの実現に期待
  https://www.tohoku.ac.jp/japanese/2022/11/press20221110-01-spin.html
  https://www.katolab.nuee.nagoya-u.ac.jp/wp/wp-content/uploads/2022/12/20221110_imass_r.pdf
  https://www.rcast.u-tokyo.ac.jp/ja/news/release/20221110.html
  https://www.nikkei.com/article/DGXZRSP643799_Q2A111C2000000/
• Feb. 2021
  プレスリリース：物質中における極のないナノ電磁石の発見 －原子間ループ電流が引き起こす新しい電子状態を観測－
  https://www.kyoto-u.ac.jp/ja/research-news/2021-02-05-0
  https://www.k.u-tokyo.ac.jp/information/category/press/8524.html
• Apr. 2019
  プレスリリース：磁性金属における圧電効果を世界で初めて観測
  https://www.c.u-tokyo.ac.jp/info/news/topics/files/20190329shiomisoubun01.pdf