Details of the Researcher

PHOTO

Katsuhiro Morita
Section
Graduate School of Science
Job title
Assistant Professor
Degree

  • doctor (Tohoku University)

e-Rad No.
30909320

Research History 6

  • 2025/07 - Present
    Tohoku University　Graduate School of Science Department of Physics

  • 2025/04 - 2025/06
    The University of Osaka

  • 2023/04 - 2025/03
    Tokyo University of Science　Faculty of Science and Technology Physics Phvsics and Astronomy

  • 2021/04 - 2023/03
    Tokyo University of Science　Faculty of Science and Technology

  • 2019/12 - 2021/03
    The University of Tokyo　Graduate School of Arts and Sciences Basic Science,Section of Multi-Disciplinary Sciences,

  • 2016/04 - 2019/11
    Tokyo University of Science　Faculty of Science, Division 1 Physics

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Education 3

  • Tohoku University　Graduate School of Science　Department of Physics

    2013/04 - 2016/03

  • Tokyo Institute of Technology　Graduate School of Science and Engineering

    2006/04 - 2008/03

  • Gakushuin University　Faculty of Science　Department of Physics

    2002/04 - 2006/03

Committee Memberships 1

  • 日本物理学会　領域３運営委員

    2023/04 - 2024/03

Research Interests 3

  • 計算物理

  • 物性理論

  • 量子スピン系

Research Areas 1

  • Natural sciences / Magnetism, superconductivity, and strongly correlated systems /

Awards 1

  1. フロンティア奨励賞

    2023/12　強磁場フォーラム　実験条件を考慮したフラストレート量子磁性体の磁化過程の理論的研究

Papers 35

  1. Quantum magnetism of the spin-1 kagome-lattice antiferromagnet

    Katsuhiro Morita

    Materials Today Quantum　2026/12

    DOI： 10.1016/j.mtquan.2026.100077 　

  2. Coupled dimerized alternating-bond quantum spin chains in the distorted honeycomb-lattice magnet Cu5SbO6

    C. Piyakulworawat, K. Morita, Y. Fukumoto, W.-Y. Hsieh, W.-T. Chen, K. Nakajima, S. Ohira-Kawamura, Y. Zhao, S. Wannapaiboon, P. Piyawongwatthana, T. J. Sato, K. Matan

    Physical Review Research　2026/03/06

    DOI： 10.1103/vdgg-d128 　

  3. Chemically tunable quantum magnetism on the anisotropic triangular lattice in rhenium oxyhalides

    Masaki Gen, Daigorou Hirai, Katsuhiro Morita, Kazuhiro Nawa, Satoshi Kogane, Naofumi Matsuyama, Takeshi Yajima, Mitsuaki Kawamura, Kazuhiko Deguchi, Akihiro Koda, Maiko Kofu, Seiko Ohira-Kawamura, Taku J. Sato, Akira Matsuo, Koichi Kindo, Yoshimitsu Kohama, Zenji Hiroi

    Nature Communications　2025/11/26

    DOI： 10.1038/s41467-025-65913-7 　

  4. One-third magnetization plateau in Quantum Kagome antiferromagnet

    Moyu Kato, Yasuo Narumi, Katsuhiro Morita, Yoshitaka Matsushita, Shuhei Fukuoka, Satoshi Yamashita, Yasuhiro Nakazawa, Migaku Oda, Hiroaki Hayashi, Kazunari Yamaura, Masayuki Hagiwara, Hiroyuki K. Yoshida

    Communications Physics　2024/12/28

    DOI： 10.1038/s42005-024-01922-0 　

  5. Valence Bond Crystal Ground State of the 1/9 Magnetization Plateau in the Spin-1/2 Kagome Lattice

    Katsuhiro Morita

    Journal of the Physical Society of Japan　2024/12/15

    DOI： 10.7566/JPSJ.93.123706 　

  6. Six magnetization plateau phases in a spin- 12 distorted kagome antiferromagnet: Application to Y3Cu9(OH)19Cl8

    Kazu Bodaiji, Katsuhiro Morita, Yoshiyuki Fukumoto

    Physical Review B　2024/09/25

    DOI： 10.1103/PhysRevB.110.104431 　

  7. Engineering of a Low-Entropy Quantum Simulator for Strongly Correlated Electrons Using Cold Atoms with SU(N) -Symmetric Interactions

    Daisuke Yamamoto, Katsuhiro Morita

    Physical Review Letters　2024/05/20

    DOI： 10.1103/PhysRevLett.132.213401 　

  8. Spin gap in the weakly interacting quantum spin chain antiferromagnet KCuPO4⋅H2O

    Fujihala, M., Hagihala, M., Morita, K., Murai, N., Koda, A., Okabe, H., Mitsuda, S.

    Phys. Rev. B　107　054435-054435　2023

    Publisher: American Physical Society

    DOI： 10.1103/PhysRevB.107.054435 　

  9. Stability of the 1/3 magnetization plateau of the J1-J2 kagome Heisenberg model

    Morita, Katsuhiro

    Phys. Rev. B　108　184405-184405　2023

    Publisher: American Physical Society

    DOI： 10.1103/PhysRevB.108.184405 　

  10. A Series Expansion Study for Large Negative Quantum Renormalization of Magnon Spectra in the S = 1/2 Kagome-Lattice Heisenberg Antiferromagnet Cs2Cu3SnF12

    Kogure ,Singo, Takeda ,Masashi, Morita ,Katsuhiro, Fukumoto ,Yoshiyuki, Saito ,Mutsuki, Tanaka ,Hidekazu

    Journal of the Physical Society of Japan　92　(11)　113703-113703　2023

    DOI： 10.7566/JPSJ.92.113703 　

  11. Effects of bond-randomness and Dzyaloshinskii–Moriya interactions on the specific heat at low temperatures of a spherical kagomé cluster in {W72V30}

    Motohashi, Mikio, Inoue, Kouki, Morita, Katsuhiro, Fukumoto, Yoshiyuki, Nakano, Hiroki

    Progress of Theoretical and Experimental Physics　2022　(11)　2022/10

    DOI： 10.1093/ptep/ptac136 　

    ISSN： 2050-3911

  12. Birchite Cd2Cu2(PO4)2SO4⋅5H2O as a model antiferromagnetic spin-1/2 Heisenberg J1-J2 chain

    Fujihala, Masayoshi, Jeschke, Harald O., Morita, Katsuhiro, Kuwai, Tomohiko, Koda, Akihiro, Okabe, Hirotaka, Matsuo, Akira, Kindo, Koichi, Mitsuda, Setsuo

    Phys. Rev. Mater.　6　114408-114408　2022

    Publisher: American Physical Society

    DOI： 10.1103/PhysRevMaterials.6.114408 　

  13. Isothermal and adiabatic magnetization processes of the spin-1/2 Heisenberg model on an anisotropic triangular lattice

    Morita, Katsuhiro

    Phys. Rev. B　105　064428-064428　2022

    Publisher: American Physical Society

    DOI： 10.1103/PhysRevB.105.064428 　

  14. Resonating dimer–monomer liquid state in a magnetization plateau of a spin-1/2 kagome-strip Heisenberg chain

    Katsuhiro Morita, Shigetoshi Sota, Takami Tohyama

    Communications Physics　2021/07/15

    DOI： 10.1038/s42005-021-00665-6 　

    ISSN： 2399-3650

    More details Close

    <jats:title>Abstract</jats:title><jats:p>Highly frustrated spin systems such as the kagome lattice are a treasure trove of new quantum states with large entanglements. Herein, we study the spin-<jats:inline-formula><jats:alternatives><jats:tex-math>$$\frac{1}{2}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mfrac> <mml:mrow> <mml:mn>1</mml:mn> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:mfrac> </mml:math></jats:alternatives></jats:inline-formula> Heisenberg model on a kagome-strip chain, which is a one-dimensional kagome lattice, using the density matrix renormalization group method. Calculating the central charge and entanglement spectrum for the kagome-strip chain, we find a gapless spin liquid state with doubly degenerate entanglement spectra in a 1/5 magnetization plateau. We also obtain a gapless low-lying continuum in the dynamic spin structure calculated using the dynamical density matrix renormalization group method. We then propose a resonating dimer–monomer liquid state that meets these features.</jats:p>

  15. Magnetic Diffuse Scattering of YBaCo4O7 and LuBaCo4O7 on Kagome and Triangular Lattices

    Soda ,Minoru, Morita ,Katsuhiro, Ehlers ,Georg, Ye ,Feng, Tohyama ,Takami, Yoshizawa ,Hideki, Masuda ,Takatsugu, Kawano-Furukawa ,Hazuki

    Journal of the Physical Society of Japan　90　(7)　074704-074704　2021

    DOI： 10.7566/JPSJ.90.074704 　

  16. Magnetic phase diagrams of the spin-1/2 Heisenberg model on a kagome-strip chain: Emergence of a Haldane phase

    Morita, Katsuhiro, Sota, Shigetoshi, Tohyama, Takami

    Phys. Rev. B　104　224417-224417　2021

    Publisher: American Physical Society

    DOI： 10.1103/PhysRevB.104.224417 　

  17. Gapless spin liquid in a square-kagome lattice antiferromagnet

    Masayoshi Fujihara, Katsuhiro Morita, Richard Mole, Setsuo Mitsuda, Takami Tohyama, Shin-ichiro Yano, Dehong Yu, Shigetoshi Sota, Tomohiko Kuwai, Akihiro Koda, Hirotaka Okabe, Hua Lee, Shinichi Itoh, Takafumi Hawai, Takatsugu Masuda, Hajime Sagayama, Akira Matsuo, Koichi Kindo, Seiko Ohira-Kawamura, Kenji Nakajima

    Nature Communications　2020/07/09

    DOI： 10.1038/s41467-020-17235-z 　

    ISSN： 2041-1723

    More details Close

    <jats:title>Abstract</jats:title><jats:p>Observation of a quantum spin liquid (QSL) state is one of the most important goals in condensed-matter physics, as well as the development of new spintronic devices that support next-generation industries. The QSL in two dimensional quantum spin systems is expected to be due to geometrical magnetic frustration, and thus a kagome-based lattice is the most probable playground for QSL. Here, we report the first experimental results of the QSL state on a square-kagome quantum antiferromagnet, KCu<jats:sub>6</jats:sub>AlBiO<jats:sub>4</jats:sub>(SO<jats:sub>4</jats:sub>)<jats:sub>5</jats:sub>Cl. Comprehensive experimental studies via magnetic susceptibility, magnetisation, heat capacity, muon spin relaxation (<jats:italic>μ</jats:italic>SR), and inelastic neutron scattering (INS) measurements reveal the formation of a gapless QSL at very low temperatures close to the ground state. The QSL behavior cannot be explained fully by a frustrated Heisenberg model with nearest-neighbor exchange interactions, providing a theoretical challenge to unveil the nature of the QSL state.</jats:p>

  18. Cluster-based Haldane states in spin-1/2 cluster chains

    Sugimoto, Takanori, Morita, Katsuhiro, Tohyama, Takami

    Phys. Rev. Res.　2　023420-023420　2020

    Publisher: American Physical Society

    DOI： 10.1103/PhysRevResearch.2.023420 　

  19. Magnetic orders induced by RKKY interaction in Tsai-type quasicrystalline approximant Au-Al-Gd

    Miyazaki, Haruka, Sugimoto, Takanori, Morita, Katsuhiro, Tohyama, Takami

    Phys. Rev. Mater.　4　024417-024417　2020

    Publisher: American Physical Society

    DOI： 10.1103/PhysRevMaterials.4.024417 　

  20. Finite-temperature properties of the Kitaev-Heisenberg models on kagome and triangular lattices studied by improved finite-temperature Lanczos methods

    Morita, Katsuhiro, Tohyama, Takami

    Phys. Rev. Res.　2　013205-013205　2020

    Publisher: American Physical Society

    DOI： 10.1103/PhysRevResearch.2.013205 　

  21. Vanishing Wilson ratio as the hallmark of quantum spin-liquid models

    Prelovıfmmode ̧hecks\else š\fiek, P., Morita, K., Tohyama, T., Herbrych, J.

    Phys. Rev. Res.　2　023024-023024　2020

    Publisher: American Physical Society

    DOI： 10.1103/PhysRevResearch.2.023024 　

  22. Magnetization plateau and supersolid phases in the spin-1/2 antiferromagnetic Heisenberg model on a tetragonally distorted fcc lattice

    Morita, Katsuhiro, Tohyama, Takami

    Phys. Rev. B　99　144417-144417　2019

    Publisher: American Physical Society

    DOI： 10.1103/PhysRevB.99.144417 　

  23. Ground-state phase diagram of the Kitaev-Heisenberg model on a kagome lattice

    Morita, Katsuhiro, Kishimoto, Masanori, Tohyama, Takami

    Phys. Rev. B　98　134437-134437　2018

    Publisher: American Physical Society

    DOI： 10.1103/PhysRevB.98.134437 　

  24. Ground state phase diagram of the Kitaev-Heisenberg model on a honeycomb-triangular lattice

    Kishimoto, Masanori, Morita, Katsuhiro, Matsubayashi, Yukihiro, Sota, Shigetoshi, Yunoki, Seiji, Tohyama, Takami

    Phys. Rev. B　98　054411-054411　2018

    Publisher: American Physical Society

    DOI： 10.1103/PhysRevB.98.054411 　

  25. Magnetic Phase Diagrams and Magnetization Plateaus of the Spin-1/2 Antiferromagnetic Heisenberg Model on a Square-Kagome Lattice with Three Nonequivalent Exchange Interactions

    Morita ,Katsuhiro, Tohyama ,Takami

    Journal of the Physical Society of Japan　87　(4)　043704-043704　2018

    DOI： 10.7566/JPSJ.87.043704 　

  26. Magnetization plateaus in the spin-1/2 antiferromagnetic Heisenberg model on a kagome-strip chain

    Morita, Katsuhiro, Sugimoto, Takanori, Sota, Shigetoshi, Tohyama, Takami

    Phys. Rev. B　97　014412-014412　2018

    Publisher: American Physical Society

    DOI： 10.1103/PhysRevB.97.014412 　

  27. Possible Tomonaga-Luttinger spin liquid state in the spin-1/2 inequilateral diamond-chain compound K3Cu3AlO2(SO4)4

    Masayoshi Fujihala, Hiroko Koorikawa, Setsuo Mitsuda, Katsuhiro Morita, Takami Tohyama, Keisuke Tomiyasu, Akihiro Koda, Hirotaka Okabe, Shinichi Itoh, Tetsuya Yokoo, Soshi Ibuka, Makoto Tadokoro, Masaki Itoh, Hajime Sagayama, Reiji Kumai, Youichi Murakami

    Scientific Reports　2017/12/01

    DOI： 10.1038/s41598-017-16935-9 　

    ISSN： 2045-2322

    More details Close

    <jats:title>Abstract</jats:title><jats:p>K<jats:sub>3</jats:sub>Cu<jats:sub>3</jats:sub>AlO<jats:sub>2</jats:sub>(SO<jats:sub>4</jats:sub>)<jats:sub>4</jats:sub> is a highly one-dimensional spin-1/2 inequilateral diamond-chain antiferromagnet. Spinon continuum and spin-singlet dimer excitations are observed in the inelastic neutron scattering spectra, which is in excellent agreement with a theoretical prediction: a dimer-monomer composite structure, where the dimer is caused by strong antiferromagnetic (AFM) coupling and the monomer forms an almost isolated quantum AFM chain controlling low-energy excitations. Moreover, muon spin rotation/relaxation spectroscopy shows no long-range ordering down to 90 mK, which is roughly three orders of magnitude lower than the exchange interaction of the quantum AFM chain. K<jats:sub>3</jats:sub>Cu<jats:sub>3</jats:sub>AlO<jats:sub>2</jats:sub>(SO<jats:sub>4</jats:sub>)<jats:sub>4</jats:sub> is, thus, regarded as a compound that exhibits a Tomonaga-Luttinger spin liquid behavior at low temperatures close to the ground state.</jats:p>

  28. Static and dynamic magnetic properties of the spin-1/2 inequilateral diamond-chain compounds A3Cu3AlO2(SO4)4(A=K,Rb,Cs)

    Morita, Katsuhiro, Fujihala, Masayoshi, Koorikawa, Hiroko, Sugimoto, Takanori, Sota, Shigetoshi, Mitsuda, Setsuo, Tohyama, Takami

    Phys. Rev. B　95　184412-184412　2017

    Publisher: American Physical Society

    DOI： 10.1103/PhysRevB.95.184412 　

  29. Exact Nonmagnetic Ground State and Residual Entropy of S=1/2 Heisenberg Diamond Spin Lattices

    Katsuhiro Morita, Naokazu Shibata

    Journal of the Physical Society of Japan　85　(3)　033705-033705　2016/03/15

    DOI： 10.7566/jpsj.85.033705 　

    ISSN： 0031-9015 1347-4073

  30. Multiple magnetization plateaus and magnetic structures in the S=1/2 Heisenberg model on the checkerboard lattice

    Morita, Katsuhiro, Shibata, Naokazu

    Phys. Rev. B　94　140404-140404　2016

    Publisher: American Physical Society

    DOI： 10.1103/PhysRevB.94.140404 　

  31. Field-Induced Quantum Phase Transitions in S = 1/2 J1–J2 Heisenberg Model on Square Lattice

    Morita ,Katsuhiro, Shibata ,Naokazu

    Journal of the Physical Society of Japan　85　(9)　094708-094708　2016

    DOI： 10.7566/JPSJ.85.094708 　

  32. Pinwheel valence-bond solid and triplet excitations in the two-dimensional deformed kagome lattice

    K. Matan, T. Ono, Y. Fukumoto, T. J. Sato, J. Yamaura, M. Yano, K. Morita, H. Tanaka

    Nature Physics　6　865-869　2010/11

    DOI： 10.1038/nphys1761 　

    ISSN： 1745-2473 1745-2481

  33. Partial ferromagnetic ordering and indirect exchange interaction in the spatially anisotropic kagome antiferromagnet Cs2Cu3CeF12

    T. Amemiya, M. Yano, K. Morita, I. Umegaki, T. Ono, H. Tanaka, K. Fujii, H. Uekusa

    Physical Review B　80　100406-100406　2009/09/25

    Publisher: American Physical Society

    DOI： 10.1103/physrevb.80.100406 　

    ISSN： 1098-0121 1550-235X

  34. Magnetic susceptibilities in a family of S=1/2 kagome antiferromagnets

    T. Ono, K. Morita, M. Yano, H. Tanaka, K. Fujii, H. Uekusa, Y. Narumi, K. Kindo

    Physical Review B　79　174407-174407　2009/05/06

    Publisher: American Physical Society

    DOI： 10.1103/physrevb.79.174407 　

    ISSN： 1098-0121 1550-235X

  35. Singlet Ground State and Spin Gap in S=1/2 Kagomé Antiferromagnet Rb2Cu3SnF12

    Katsuhiro Morita, Midori Yano, Toshio Ono, Hidekazu Tanaka, Kotaro Fujii, Hidehiro Uekusa, Yasuo Narumi, Koichi Kindo

    Journal of the Physical Society of Japan　2008/04/15

    DOI： 10.1143/jpsj.77.043707 　

    ISSN： 0031-9015 1347-4073

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Misc. 1

  1. カゴメ反強磁性体における量子磁性―磁化プラトーを中心に― Invited Peer-reviewed

    森田克洋

    固体物理　61　(4)　2026/04/15

Presentations 9

  1. Thermodynamics and Magnetocaloric Effect of the Antiferromagnetic Kagome Ising Model

    Yuta Mochizuki, Katsuhiro Morita

    Novel Physics in Kagome Lattice Materials　2026/10/07

  2. Quantum Magnetism of the Spin-1 Kagome-Antiferromagnet

    Katsuhiro Morita

    Novel Physics in Kagome Lattice Materials　2026/10/07

  3. Spin-１カゴメ反強磁性体の量子磁性 Invited

    森田克洋

    第3回 東西日本強磁場科学研究会　2026/09/17

  4. スピン1カゴメ格子反強磁性体の量子磁性

    森田克洋

    日本物理学会 第81回年次大会　2026/09/17

  5. 量子計算機に適した有限温度量子クリロフ法の数値検証

    山本寛人, 森田克洋

    日本物理学会 第81回年次大会　2026/09/14

  6. S=5/2デルタ鎖化合物 (C₂H₁₀N₂)[Mn₂(HPO₄)₃(H₂O)] の磁性に関する理論解析

    森田克洋

    第22回量子スピン系研究会　2026/08/30

  7. Spin-1カゴメ格子の磁気特性

    森田克洋

    第21回量子スピン系研究会　2025/12

  8. カゴメ格子反強磁性体の1/9磁化プラトーの磁気構造

    森田克洋

    日本物理学会 第80回年次大会　2025/09

  9. Ground state of the 1/9 magnetization plateau in the spin-1/2 kagome lattice

    Katsuhiro Morita

    30th International Conference on Low Temperature Physics (LT30)　2025/08/09

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Research Projects 1

  1. 断熱環境下における量子スピン系の磁化過程の理論的研究

    森田 克洋

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(C)

    Institution: 東北大学

    2025/04 - 2029/03

Social Activities 1

  1. 多様な元素置換が可能な歪んだ三角格子反強磁性体を開発 ―「複合アニオン化合物」で磁性の一次元化の謎に迫る―

    東北大学プレスリリース・研究成果

    2025/11/27 - 2025/11/27

Academic Activities 1

  1. 固体物理 小特集「カゴメフラストレート磁性研究の新展開」編集

    2025/12 - 2026/04

    Activity type: Other