Charge-fluctuation mechansim of high-temperature superconductivity in cuprates using resonant inelastic x-ray scattering

• Project/Area Number: 19K03741
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: The University of Tokyo (2022); Waseda University (2019-2021)
• Principal Investigator: Fujimori Atsushi 東京大学, 大学院理学系研究科(理学部), 名誉教授 (10209108)
• Co-Investigator(Kenkyū-buntansha): 溝川 貴司 早稲田大学, 理工学術院, 教授 (90251397)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 高温超伝導体 / 共鳴軟X線非弾性散乱 / 角度分解光電子分光 / 高温超伝導 / 非弾性X線散乱

Outline of Research at the Start

銅酸化物における高温超伝導の発見以来30年以上の間、膨大な研究が行われてきたにもかかわらず高温超伝導の発現機構は未だ解明されていない。従来型超伝導体で確立してきた電子-フォノン相互作用機構では高い超伝導転移温度を説明することが困難なため、磁気的ゆらぎによる超伝導機構がされ活発に研究されてきた。一方、電荷ゆらぎによる超伝導機構は具体的な理論研究が少なく、実験的な検証はさらに遅れている。本研究では、高輝度放射光を用いた共鳴軟X線散乱実験により電荷ゆらぎのダイナミクスを直接観測し、高温超伝導発現における電荷ゆらぎの重要性を明らかにする。

Outline of Final Research Achievements

Charge order, charge excitation, and phonon anomalies in cuprate high-temperature superconductors were studied by resonant inelastic x-ray scattering, and new insights into the superconductivity mechanism and the nature of the enigmatic pseudogap were obtained. Critical charge fluctuations and phonon anomalies associated with the quantum phase transition between the pseudogap phase and the Fermi-liquid phase were identified in the low-energy region near the charge-order peak. At higher energies, spectral changes in the exciton peak between the pseudogap phase and the superconducting phase were observed as predicted by the excitonic charge-fluctuation mechanism of superconductivity. At even higher energies, “acoustic plasmon”, a collective charge excitation of two-dimensional electron system was first observed in hole-doped cuprates. Using angle-resolved photoemission spectroscopy, a nematic electronic structure was identified in the pseudogap phase.

Academic Significance and Societal Importance of the Research Achievements

発見から35年間の膨大な研究努力にもかかわらず未解決である銅酸化物高温超伝導体の超伝導発現機構と擬ギャップ形成機構を、従来主流であったスピン自由度に注目した研究から視点を変え、電荷ゆらぎに注目して解明を目指し成果を挙げた。実験手法として既に確立している角度分解光電子分光に加えて、新しい手法である共鳴非弾性X線散乱を高い分解能で利用し、電荷秩序、電荷励起、フォノン異常について新しい知見を得ることによって、電荷ゆらぎによる高温超伝導発現機構と擬ギャップ形成機構の確立に大きく近付いた。

Research Products

• [Int'l Joint Research] 国家同歩輻射研究中心/国立清華大学(台湾)
• [Int'l Joint Research] Institute of Metal Physics(ロシア連邦)
• [Int'l Joint Research] 国家同歩輻射研究中心(台湾)
• [Int'l Joint Research] Institute of Metal Physics(ロシア連邦)
• [Int'l Joint Research] 国家同歩輻射研究中心(台湾)
• [Int'l Joint Research] チューリッヒ大学(スイス)
• [Int'l Joint Research] 国家同歩輻射研究中心(台湾)
• [Int'l Joint Research] スタンフォード大学(米国)
• [Journal Article] Connecting the one-band and three-band Hubbard models of cuprates via spectroscopy and scattering experiments (2023)
  • Author(s): Sheshadri K.、Malterre D.、Fujimori A.、Chainani A.
  • Journal Title: Physical Review B Volume: 107 Issue: 8
  • DOI: 10.1103/physrevb.107.085125
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Structure of monolayer FeSe on SrTiO3 deciphered (2023)
  • Author(s): Atsushi Fujimori
  • Journal Title: Journal Club for Condensed Matter Physics Volume: -
  • DOI: 10.36471/jccm_february_2023_01
• [Journal Article] Soft x-ray spetroscopies of high-temperature superconductors (2023)
  • Author(s): A. Fujimori and D.-J. Huang
  • Journal Title: Synchrotron Radiation News Volume: -
  • Int'l Joint Research
• [Journal Article] Magnetic Properties and Electronic Configurations of Mn Ions in the Diluted Magnetic Semiconductor Ba_1-<i>_x</i>K<i>_x</i>(Zn_1-<i>_y</i>Mn<i>_y</i>)₂As₂ Studied by X-ray Magnetic Circular Dichroism and Resonant Inelastic X-ray Scattering (2022)
  • Author(s): Suzuki Hakuto、Zhao Guoqiang、Okamoto Jun、Sakamoto Shoya、Chen Zhi-Yin、Nonaka Yosuke、Shibata Goro、Zhao Kan、Chen Bijuan、Wu Wen-Bin、Chang Fan-Hsiu、Lin Hong-Ji、Chen Chien-Te、Tanaka Arata、Kobayashi Masaki、Gu Bo、Maekawa Sadamichi、Uemura Yasutomo J.、Jin Changqing、Huang Di-Jing、Fujimori Atsushi
  • Journal Title: Journal of the Physical Society of Japan Volume: 91 Issue: 6 Pages: 1-5
  • DOI: 10.7566/jpsj.91.064710
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Acoustic plasmons and conducting carriers in hole-doped cuprate superconductors (2022)
  • Author(s): Singh A.、Huang H. Y.、Lane Christopher、Li J. H.、Okamoto J.、Komiya S.、Markiewicz Robert S.、Bansil Arun、Lee T. K.、Fujimori A.、Chen C. T.、Huang D. J.
  • Journal Title: Physical Review B Volume: 105 Issue: 23
  • DOI: 10.1103/physrevb.105.235105
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Cr doping-induced ferromagnetism in the spin-glass Cd1-Mn Te studied by x-ray magnetic circular dichroism (2022)
  • Author(s): Verma V.K.、Sakamoto S.、Ishikawa K.、Singh V.R.、Ishigami K.、Shibata G.、Kadono T.、Koide T.、Kuroda S.、Fujimori A.
  • Journal Title: Physica B: Condensed Matter Volume: 642 Pages: 414129-414129
  • DOI: 10.1016/j.physb.2022.414129
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Unconventional exciton evolution from the pseudogap to superconducting phases in cuprates (2022)
  • Author(s): Singh A.、Huang H. Y.、Xie J. D.、Okamoto J.、Chen C. T.、Watanabe T.、Fujimori A.、Imada M.、Huang D. J.
  • Journal Title: Nature Communications Volume: 13 Issue: 1
  • DOI: 10.1038/s41467-022-35210-8
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] 一軸性圧力下の高温超伝導体 (2022)
  • Author(s): 藤森淳、中田勝
  • Journal Title: 固体物理 Volume: 57 Pages: 297-306
  • Peer Reviewed
• [Journal Article] What can we learn from the nickelate vs. cuprate phase diagrams? (2022)
  • Author(s): Atsushi Fujimori
  • Journal Title: Journal Club for Condensed Matter Physics Volume: -
  • DOI: 10.36471/jccm_april_2022_01
• [Journal Article] Magnetic anisotropy of the van der Waals ferromagnet Cr2Ge2Te6 studied by angular-dependent xray magnetic circular dichroism (2022)
  • Author(s): Suzuki M.、Gao B.、Shibata G.、Sakamoto S.、Nonaka Y.、Ikeda K.、Chi Z.、Wan Y.-X.、Takeda T.、Takeda Y.、Koide T.、Tanaka A.、Kobayashi M.、Cheong S.-W.、Fujimori A.
  • Journal Title: Physical Review Research Volume: 4 Issue: 1
  • DOI: 10.1103/physrevresearch.4.013139
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Selective observation of surface and bulk bands in polar WTe2 by laser-based spin- and angle-resolved photoemission spectroscopy (2022)
  • Author(s): Yuxuan Wan, Lihai Wang, Kenta Kuroda, Peng Zhang, Keisuke Koshiishi, Masahiro Suzuki, Jaewook Kim, Ryo Noguchi, C_dric Bareille, Koichiro Yaji, Ayumi Harasawa, Shik Shin, Sang-Wook Cheong, Atsushi Fujimori, and Takeshi Kondo
  • Journal Title: Phys. Rev. B Volume: 105 Issue: 8 Pages: 085421-085421
  • DOI: 10.1103/physrevb.105.085421
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Resonant inelastic X-ray scattering as a probe of Jeff=1/2 state in 3d transition-metal oxide (2022)
  • Author(s): Huang H. Y.、Singh A.、Wu C. I.、Xie J. D.、Okamoto J.、Belik A. A.、Kurmaev E.、Fujimori A.、Chen C. T.、Streltsov S. V.、Huang D. J.
  • Journal Title: npj Quantum Materials Volume: 7 Issue: 1
  • DOI: 10.1038/s41535-022-00430-0
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Fermi Surface Geometry and Inhomogeneous Electronic States in Pr1.3-xLa0.7CexCuO4 (x = 0.05) with Small Superconducting Volume Fraction (2021)
  • Author(s): Matsuzawa Yu、Morita Tomohiro、Arita Masashi、Giampietri Alessio、Kandyba Viktor、Barinov Alexey、Takahashi Akira、Nagakubo Yusuke、Adachi Tadashi、Koike Yoji、Fujimori Atsushi、Saini Naurang L.、Mizokawa Takashi
  • Journal Title: Journal of the Physical Society of Japan Volume: 90 Issue: 5 Pages: 054704-054704
  • DOI: 10.7566/jpsj.90.054704
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Realization of Electron Antidoping by Modulating the Breathing Distortion in BaBiO₃ (2021)
  • Author(s): Cao Hui、Guo Hongli、Shao Yu-Cheng、Liu Qixin、Feng Xuefei、Lu Qinwen、Wang Zhongping、Zhao Aidi、Fujimori Atsushi、Chuang Yi-De、Zhou Hua、Zhai Xiaofang
  • Journal Title: Nano Letters Volume: 21 Issue: 9 Pages: 3981-3988
  • DOI: 10.1021/acs.nanolett.1c00750
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Large Orbital Magnetic Moment and Strong Perpendicular Magnetic Anisotropy in Heavily Intercalated Fe_<i>x</i>TiS₂ (2021)
  • Author(s): Shibata Goro、Won Choongjae、Kim Jaewook、Nonaka Yosuke、Ikeda Keisuke、Wan Yuxuan、Suzuki Masahiro、Koide Tsuneharu、Tanaka Arata、Cheong Sang-Wook、Fujimori Atsushi
  • Journal Title: The Journal of Physical Chemistry C Volume: 125 Issue: 23 Pages: 12929-12936
  • DOI: 10.1021/acs.jpcc.1c02345
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Evolution of valence- and spin-specific local distortions in La2-xSrxCoO4 (2021)
  • Author(s): J. Okamoto, A. Chainani, Z.Y. Chen, H.Y. Huang, A. Singh, T. Sasagawa, D.I. Khomskii, A. Fujimori, C.T. Chen,and D.J. Huang
  • Journal Title: Physical Review B Volume: 104 Issue: 5
  • DOI: 10.1103/physrevb.104.054417
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Nematicity in a cuprate superconductor revealed by angle-resolved photoemission spectroscopy under uniaxial strain (2021)
  • Author(s): Nakata S.、Horio M.、Koshiishi K.、Hagiwara K.、Lin C.、Suzuki M.、Ideta S.、Tanaka K.、Song D.、Yoshida Y.、Eisaki H.、Fujimori A.
  • Journal Title: npj Quantum Materials Volume: 6 Issue: 1
  • DOI: 10.1038/s41535-021-00390-x
  • Peer Reviewed / Open Access
• [Journal Article] Reduced magnetocrystalline anisotropy of CoFe2O4 thin films studied by angle-dependent x-ray magnetic circular dichroism (2021)
  • Author(s): Nonaka Yosuke、Wakabayashi Yuki K.、Shibata Goro、Sakamoto Shoya、Ikeda Keisuke、Chi Zhendong、Wan Yuxuan、Suzuki Masahiro、Koide Tsuneharu、Tanaka Masaaki、Nakane Ryosho、Fujimori Atsushi
  • Journal Title: AIP Advances Volume: 11 Issue: 8 Pages: 085317-085317
  • DOI: 10.1063/5.0057576
  • Peer Reviewed / Open Access
• [Journal Article] Hidden self-energies as origin of cuprate superconductivity revealed by machine learning (2021)
  • Author(s): Y. Yamaji, T. Yoshida, A. Fujimori, and M. Imada
  • Journal Title: Phys. Rev. Res. Volume: 3 Issue: 4 Pages: 1-37
  • DOI: 10.1103/physrevresearch.3.043099
  • NAID: 120007168541
  • Peer Reviewed / Open Access
• [Journal Article] Hybridization of Bogoliubov quasiparticles between adjacent CuO2 layers in the triple-layer cuprate Bi2Sr2Ca2Cu3O10+δ studied by angle-resolved photoemission spectroscopy (2021)
  • Author(s): Ideta S.、Johnston S.、Yoshida T.、Tanaka K.、Mori M.、Anzai H.、Ino A.、Arita M.、Namatame H.、Taniguchi M.、Ishida S.、Takashima K.、Kojima K.?M.、Devereaux T.?P.、Uchida S.、Fujimori A.
  • Journal Title: Physical Review Letters Volume: 127 Issue: 21 Pages: 217004-217004
  • DOI: 10.1103/physrevlett.127.217004
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Quantum Fluctuations of Charge Order Induce Phonon Softening in a Superconducting Cuprate (2021)
  • Author(s): Huang H. Y.、Singh A.、Mou C. Y.、Johnston S.、Kemper A. F.、van den Brink J.、Chen P. J.、Lee T. K.、Okamoto J.、Chu Y. Y.、Li J. H.、Komiya S.、Komarek A. C.、Fujimori A.、Chen C. T.、Huang D. J.
  • Journal Title: Physical Review X Volume: 11 Issue: 4
  • DOI: 10.1103/physrevx.11.041038
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Superconducting gap and pseudogap in the surface states of the iron-based superconductor PrFeAsO1－y studied by angle-resolved photoemission spectroscopy (2021)
  • Author(s): Hagiwara K.、Ishikado M.、Horio M.、Koshiishi K.、Nakata S.、Ideta S.、Tanaka K.、Horiba K.、Ono K.、Kumigashira H.、Yoshida T.、Ishida S.、Eisaki H.、Shamoto S.、Fujimori A.
  • Journal Title: Physical Review Research Volume: 3 Issue: 4
  • DOI: 10.1103/physrevresearch.3.043151
  • Peer Reviewed / Open Access
• [Journal Article] Extended superconducting dome revealed by angle-resolved photoemission spectroscopy of electron-doped cuprates prepared by the protect annealing method (2021)
  • Author(s): Lin C.、Adachi T.、Horio M.、Ohgi T.、Baqiya M. A.、Kawamata T.、Sato H.、Sumura T.、Koshiishi K.、Nakata S.、Shibata G.、Hagiwara K.、Suzuki M.、Ono K.、Horiba K.、Kumigashira H.、Ideta S.、Tanaka K.、Koike Y.、Fujimori A.
  • Journal Title: Physical Review Research Volume: 3 Issue: 1
  • DOI: 10.1103/physrevresearch.3.013180
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Anisotropic Spin Distribution and Perpendicular Magnetic Anisotropy in a Layered Ferromagnetic Semiconductor (Ba,K)(Zn,Mn)2As2 (2021)
  • Author(s): Sakamoto Shoya、Zhao Guoqiang、Shibata Goro、Deng Zheng、Zhao Kan、Wang Xiancheng、Nonaka Yosuke、Ikeda Keisuke、Chi Zhendong、Wan Yuxuan、Suzuki Masahiro、Koide Tsuneharu、Tanaka Arata、Maekawa Sadamichi、Uemura Yasutomo J.、Jin Changqing、Fujimori Atsushi
  • Journal Title: ACS Applied Electronic Materials Volume: 3 Issue: 2 Pages: 789-794
  • DOI: 10.1021/acsaelm.0c00938
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Hard and soft x-ray photoemission spectroscopy study of the new Kondo system SmO thin film (2020)
  • Author(s): Sakamoto Shoya、Kaminaga Kenichi、Oka Daichi、Yukawa Ryu、Horio Masafumi、Yokoyama Yuichi、Yamamoto Kohei、Takubo Kou、Nonaka Yosuke、Koshiishi Keisuke、Kobayashi Masaki、Tanaka Arata、Yasui Akira、Ikenaga Eiji、Wadati Hiroki、Kumigashira Hiroshi、Fukumura Tomoteru、Fujimori Atsushi
  • Journal Title: Physical Review Materials Volume: 4 Issue: 9 Pages: 1-5
  • DOI: 10.1103/physrevmaterials.4.095001
  • Peer Reviewed
• [Journal Article] Oxide Fermi liquid universality revealed by electron spectroscopy (2020)
  • Author(s): Horio M.、Kramer K. P.、Wang Q.、Zaidan A.、von Arx K.、Sutter D.、Matt C. E.、Sassa Y.、Plumb N. C.、Shi M.、Hanff A.、Mahatha S. K.、Bentmann H.、Reinert F.、M.、Rossnagel K.、Rienks E.、Vecchione A.、Kawamata T.、Adachi T.、Koike Y.、Fujimori A.、Hoesch M.、Chang J. et al.
  • Journal Title: Physical Review B Volume: 102 Issue: 24
  • DOI: 10.1103/physrevb.102.245153
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] d-wave superconducting gap observed in protect-annealed electron-doped cuprate superconductors Pr1.3-xLa0.7CexCuO4 (2019)
  • Author(s): Horio M.、Koshiishi K.、Nakata S.、Hagiwara K.、Ota Y.、Okazaki K.、Shin S.、Ideta S.、Tanaka K.、Takahashi A.、Ohgi T.、Adachi T.、Koike Y.、Fujimori A.
  • Journal Title: Physical Review B Volume: 100 Issue: 5 Pages: 054517-054517
  • DOI: 10.1103/physrevb.100.054517
  • Peer Reviewed
• [Journal Article] Nature of Carrier Doping in T′-La1.8-xEu0.2SrxCuO4 Studied by X-Ray Photoemission and Absorption Spectroscopy (2019)
  • Author(s): Lin Chun、Horio Masafumi、Kawamata Takayuki、Saito Shin、Koshiishi Keisuke、Sakamoto Shoya、Zhang Yujun、Yamamoto Kohei、Ikeda Keisuke、Hirata Yasuyuki、Takubo Kou、Wadati Hiroki、Yasui Akira、Takagi Yasumasa、Ikenaga Eiji、Adachi Tadashi、Koike Yoji、Fujimori Atsushi
  • Journal Title: Journal of the Physical Society of Japan Volume: 88 Issue: 11 Pages: 115004-115004
  • DOI: 10.7566/jpsj.88.115004
  • NAID: 210000157425
  • Peer Reviewed
• [Journal Article] Band-dependent superconducting gap in SrFe2(As0.65P0.35)2 studied by angle-resolved photoemission spectroscopy (2019)
  • Author(s): Suzuki H.、Kobayashi T.、Miyasaka S.、Okazaki K.、Yoshida T.、Horio M.、Ambolode L. C. C.、Ota Y.、Yamamoto H.、Shin S.、Hashimoto M.、Lu D. H.、Shen Z.-X.、Tajima S.、Fujimori A.
  • Journal Title: Scientific Reports Volume: 9 Issue: 1 Pages: 16418-16418
  • DOI: 10.1038/s41598-019-52887-y
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] 硬X 線磁気円二色 性によるBa2CaOsO6 の磁気転移・多極子秩序に関す る研究、 (2023)
  • Author(s): 芝田悟朗、林浩章、河村直己、岡本淳、D.-J. Huang、 S. Streltkov、山浦一成、藤森淳
  • Organizer: 第36 回日本放射光学会年会・放射光科学合 同シンポジウム
• [Presentation] ARPES to RIXS studies of high-temperature superconductors (2023)
  • Author(s): A. Fujimori and D. J. Huang
  • Organizer: 21st Taiwan-Japan-Korea Symposium on Strongly Correlated Electron Systems
  • Int'l Joint Research / Invited
• [Presentation] Momentum-resolved RIXS studies on high-temperature superconductor Bi2212 (2023)
  • Author(s): J. S. Su, H. Y. Huang, A. Singh, J. Okamoto, C. T. Chen, T. Watanabe, C. Y. Mou, T. K. Lee, A. Fujimori, and D. J. Huang
  • Organizer: 21st Taiwan-Japan-Korea Symposium on Strongly Correlated Electron Systems
  • Int'l Joint Research
• [Presentation] Electron fractionalization in the pseudogap state of cuprates detected by RIXS (2023)
  • Author(s): A. Fujimori, A. Singh, H. Y. Huang, T. Watanabe, M. Imada, and D. J. Huang
  • Organizer: 8th International Conference on Superconductivity and Magnetism
  • Int'l Joint Research / Invited
• [Presentation] Nodal metallic behavior of underdoped triple-layer cuprate Bi2223 (2023)
  • Author(s): S. Ideta, T. Yoshida, K. Tanaka, W. O. Wang, B. Moritz, T. P. Devereaux, T. K. Lee, C. Y. Mou, S. Adachi, N. Sakaki, S. Yamaguchi, T. Watanabe, T. Noji, S. Uchida, S. Ishida, and A. Fujimori
  • Organizer: 15th International Conference on Electronic Spectroscopy and Structure
  • Int'l Joint Research
• [Presentation] Electron fractionalization in the pseudogap state of cuprates revealed by resonant inelastic x-ray scattering (2022)
  • Author(s): A. Fujimori
  • Organizer: International Conference on Quantum Materials and Technologies
  • Int'l Joint Research / Invited
• [Presentation] Spectroscopic manifestations of electron fractionalization in the pseudogap state of cuprates (2022)
  • Author(s): A. Fujimori, A. Singh, M. Horio, S. Sakai, M. Imada, and D.-J. Huang
  • Organizer: 2nd Global Summit on Condensed Matter Physics
  • Int'l Joint Research / Invited
• [Presentation] Spectroscopic manifestations of electron fractionalization in the pseudogap state of cuprates (2022)
  • Author(s): A. Fujimori, A. Singh, M. Horio, S. Sakai, M. Imada, and D.-J. Huang
  • Organizer: Spectroscopies in Novel Superconductors
  • Int'l Joint Research / Invited
• [Presentation] Doping dependence of the energy gap in the triple-layer cuprate Bi2223 (2022)
  • Author(s): S. Ideta, K. Tanaka, T. Yoshida, S. Adachi, S. Yamaguchi, N. Sasaki, T. Watanabe, T. Noji, S. Ishida, S. Uchida, and A. Fujimori
  • Organizer: International Workshop on Correlation and Angle-Resolved Photoemission Spectroscopy
  • Int'l Joint Research
• [Presentation] Acoustic plasmons in electron- and holedoped cuprates studied by resonant inelastic xray scattering at the oxygen K edge (2022)
  • Author(s): N. Moritsuna, A. Matsumoto, J. Okamoto, A. Singh, H. Y. Huang, J.-H. Li, A. Takahashi, T. Konno, H. Sato, Y. Koike, T. Adachi, T. Mizokawa, C. T. Chen, D. J. Huang, and A. Fujimori
  • Organizer: 29-th International Conference on Low Temperature Physics
  • Int'l Joint Research
• [Presentation] 擬ギャップ相における高温 超伝導体La2－xSrxCuO4 の電子状態の温度依存性 (2022)
  • Author(s): 石田達拡、大槻太毅、北村未歩、藤森淳、小宮世紀、安藤陽一、吉田鉄平
  • Organizer: 日本物理学会2022 年秋季大会
• [Presentation] Synchrotron-radiation spectroscopy of transition-metal oxides and high-temperature superconductors (2022)
  • Author(s): A. Fujimori
  • Organizer: Colloquium on Modern Problems of Condensed Matter Physics
  • Invited
• [Presentation] 強い垂直磁気異方性を示す層状磁 性体FexTaS2 のX 線磁気円二色性: FexTiS2との比較 (2022)
  • Author(s): 芝田悟朗、C. Won、J. Kim、野中洋亮、池田啓祐、万 宇軒、鈴木雅弘、小出常晴、田中新、S.-W. Cheong、 齋藤智彦、藤森
  • Organizer: 日本物理学会第77回年次大会
• [Presentation] Origin of perpendicular magnetic anisotropy in 2D materials studied by angle-dependent XMCD (2021)
  • Author(s): Atsushi Fujimori
  • Organizer: Interdisciplinary Topics in Advanced Materials (ITAM2021)
  • Int'l Joint Research / Invited
• [Presentation] Open issues in high-temperature superconducting cuprates and advanced spectroscopic studies (2021)
  • Author(s): Atsushi Fujimori
  • Organizer: Global Summit on Condensed Matter Physics (CONMAT2021)
  • Int'l Joint Research / Invited
• [Presentation] Hybridization of the electronic structure in triplelayer high-Tc cuprate Bi2223 observed by ARPES (2021)
  • Author(s): S. Ideta, S. Johnston, T. Yoshida, K. Tanaka, M.Mori, H. Anzai, A. Ino, M. Arita, H. Namatame,M. Taniguchi, S. Ishida, K. Takashima, K. M. Kojima,T. P. Devereaux, S. Uchida, and A. Fujimori
  • Organizer: 26th Hiroshima International Symposium on Synchrotron Radiation
  • Int'l Joint Research
• [Presentation] 最適ドープ Bi2Sr2CaCu2O8+δ の正常・異常自己エネルギー解析 (2021)
  • Author(s): 宇陀愼太郎、大槻太毅、山脇一真、有田将司、生 天目博文、出田真一郎、田中清尚、笹川崇男、藤 森淳、組頭広志、小野寛太、吉田鉄平
  • Organizer: 日本物理学会2021年秋季大会
• [Presentation] Material trends in the chemical bonding and electronic structure of quantum materials (2020)
  • Author(s): Atsushi Fujimori
  • Organizer: Summer School of the IMPRS & MPI-UBC- UTokyo Center "Design and Synthesis of Quan- tum Materials"
  • Int'l Joint Research / Invited
• [Presentation] Charge order and excitation in high-Tc cuprates studied by RIXS (2020)
  • Author(s): Atsushi Fujimori
  • Organizer: International Conference on Fugaku project “Emergence and Functionality of Quantum Matter (EFQM 2020)”
  • Int'l Joint Research / Invited
• [Presentation] 共鳴非弾性 X 線散乱によるPr1.3-xLa0.7CexCuO4 の電荷励起・ 電荷秩序の解明 (2020)
  • Author(s): 森綱尚輝, 松本篤彦, 溝川貴司, 藤森淳, 岡本淳, A. Singh, H. Y. Huang, D. J. Huang, J. H. Li, 足立匡, 高橋晶, 今野巧也, 佐藤秀孝, 小池洋二
  • Organizer: 日本物理学会2020 年秋季大会
• [Presentation] 共鳴非弾性X 線散乱を用いたPr1.3-xLa0.7CexCuO4 のフォ ノン解析 (2020)
  • Author(s): 松本篤彦, 森綱尚輝, 溝川貴司, 藤森淳, 岡本淳, A. Singh, H. Y. Huang, D. J. Huang, J. H. Li, 足立 匡, 高橋晶, 今野巧也, 佐藤秀孝, 小池洋二
  • Organizer: 日本物理学会第76 回年次大会
• [Presentation] Nematicity in high-temperature superconductors probed by ARPES (2020)
  • Author(s): Atsushi Fujimori
  • Organizer: 20th Korea-Taiwan-Japan Symposium on Strongly Correlated Electron Systems
  • Int'l Joint Research / Invited
• [Presentation] Open issues and synchrotron radiation spectroscopy of electron-doped high-Tc cuprates (2020)
  • Author(s): Atsushi Fujimori
  • Organizer: International Workshop for Synergetic Collaboration between Material and Synchrotron Science through IMR-MAX IV Joint Research
  • Int'l Joint Research / Invited
• [Presentation] Pseudogap and nematicity in high- temperature superconductors studied by synchrotron radiation spectroscopy (2020)
  • Author(s): Atsushi Fujimori
  • Organizer: National Conference on Advanced Materials and Nuclear Science (AMNS-2020)
  • Invited
• [Presentation] Electronic nematic phases in Fe-based and cuprate superconductors, (2019)
  • Author(s): Atsushi Fujimori
  • Organizer: Advances in Electron Spectroscopy - Experiment and Theory (AESET 2019)
  • Int'l Joint Research / Invited
• [Presentation] Origin of the pseudogap in electron- doped and hole-doped cuprates revealed by ARPES (2019)
  • Author(s): Atsushi Fujimori
  • Organizer: International Conference on Frontiers of Correlated Electron Sciences (FCES19)
  • Int'l Joint Research / Invited
• [Presentation] ARPES studies of electronic nematic phases in cuprate and iron-based superconductors (2019)
  • Author(s): Atsushi Fujimori
  • Organizer: Research Frontier of Advanced Spectroscopies for Correlated Electron Systems
  • Int'l Joint Research / Invited
• [Presentation] ARPES studies of electronic nematic phases in cuprate and iron-pnictide superconductors (2019)
  • Author(s): Atsushi Fujimori, Suguru Nakata, and Keisuke Koshiishi
  • Organizer: International Conference on Strongly Correlated Electron Systems (SCES2019)
  • Int'l Joint Research / Invited
• [Presentation] ARPES studies of electronic nematic phases in cuprate and iron-pnictide superconductors (2019)
  • Author(s): Atsushi Fujimori, Suguru Nakata, and Keisuke Koshiishi
  • Organizer: Electron Correlation in Superconductors and Nanostructures (ECSN-2019)
  • Int'l Joint Research / Invited
• [Presentation] 軟X 線分光で見る量子物質 (2019)
  • Author(s): 藤森 淳
  • Organizer: 東北大量子物質・放射光理学研究科放射光シンポジウム - 量子物質 科学のフロンティア
  • Invited
• [Presentation] T ’型銅酸化物の硬X 線光電子分光・軟X 線 吸収・共鳴軟X 線散乱 (2019)
  • Author(s): 藤森 淳
  • Organizer: 科研費合同研究会2019
• [Presentation] 角度分解光電子分光による三層系銅酸化物 高温超伝導体Bi2Sr2Ca2Cu3O10+d のホールドープ 依存性 (2019)
  • Author(s): 出田真一郎, 吉田鉄平, 藤森淳, 足立伸太郎, 山口隼平, 佐々木菜絵, 渡辺孝夫, 野地尚, 石田茂之, 内田慎一, 田中清尚
  • Organizer: 日 本物理学会2019年秋季大会
• [Remarks] Fujimori Group
  • URL: https://sites.google.com/view/fujimorigroup/home?authuser=0
• [Remarks] NSRRC TPS Beamlines - 41A Soft X-ray Scattering
  • URL: http://tpsbl.nsrrc.org.tw/bd_page.aspx?lang=en&port=41A&pid=1044
• [Remarks] 国立清華大学物理学系 牟中瑜教授
  • URL: https://phys.site.nthu.edu.tw/p/406-1335-58759,r3581.php?Lang=zh-tw
• [Remarks] TPS Beamlines - 41A Soft X-ray Scattering
  • URL: http://tpsbl.nsrrc.org.tw/bd_page.aspx?lang=en&port=41A&pid=1044
• [Remarks] University of Zuerich - Johan Chang group
  • URL: https://www.physik.uzh.ch/groups/chang/
• [Remarks] Stanford University - Shen Laboratory
  • URL: https://arpes.stanford.edu/research/overview