[11/28] The 25th “AIMR Seminar”
Speaker
Prof. Yusuke Nomura (PI of AIMR, Tohoku University)
Title
Toward a Deeper Understanding and Theoretical Prediction of Quantum Many-Body Phenomena
Date
November 28 (Fri), 2025, 14:00–14:55 on Japan Time
Venue
Seminar Room, 2nd floor, AIMR Main Building
Abstract
In this seminar, I will address two themes: (i) the use of machine learning as a new tool to deepen our understanding of quantum many-body physics; and (ii) the design of new materials, illustrated by a theoretical proposal for candidate superconductors.
(i) Developing a machine-learning solver and tackling the spin-liquid problem
In strongly correlated quantum systems, conventional numerical methods may lead to incorrect understanding due to biases arising from human intuition. To overcome this, we have developed a novel methodology based on machine-learning techniques, capable of capturing non-trivial quantum correlations beyond human insight [1]. We applied our method to the frustrated square-lattice J1–J2 Heisenberg model and performed a state-of-the-art analysis, making a substantial contribution toward deepening our understanding of the long-standing physics challenge of quantum spin liquids [2].
(ii) Theoretical proposal of layered nickelates as candidates for novel superconductors
Motivated by the discovery of superconductivity in infinite-layer nickelates, we carried out electronic-structure calculations for these systems, clarifying their similarities and differences with the cuprate high-temperature superconductors [3]. Based on these insights, we proposed design guidelines for new materials whose electronic structures are even closer to those of the cuprates. These new materials are expected to serve as ideal platforms for exploring high-temperature superconductivity in nickelates [4,5]. Our work represents an effort to extend theory-driven materials development from weakly correlated systems into the realm of strongly correlated systems.
References
- [1] For a review, Y. Nomura and M. Imada, J. Phys. Soc. Jpn. 94, 031001 (2025).
- [2] Y. Nomura and M. Imada, Phys. Rev. X 11, 031034 (2021).
- [3] For a review, Y. Nomura and R. Arita, Rep. Prog. Phys. 85, 052501 (2022).
- [4] M. Hirayama, T. Tadano et al., Phys. Rev. B 101, 075107 (2020).
- [5] YN et al., Phys. Rev. Research 2, 043144 (2020).
AIMR Seminars and Tea Time
We hold AIMR Seminars and Friday Tea Time as part of the initiative to promote fusion research.
Seminars are presented by AIMR researchers and visiting scientists who provide a wide range of hot topics from materials science to mathematics. The aims of the AIMR Seminar are to build up mutual understanding, communication, and discussions of each other’s research fields.
Weekly held Friday Tea Time is where AIMR researchers and staff members can relax and talk freely while drinking coffee. Expectations of stimulating conversation may arise among the researchers and leading to new research.
From 2024, active fusion research through synergistic effects from AIMR Seminars and Friday Tea Time will be promoted.
Past AIMR Seminar
| 27th | Jan. 30, 2026 | Dr. Tomohiro Otsuka (Jr. PI of AIMR, Tohoku University) |
|---|---|---|
| 26th | Dec. 5, 2025 | Dr. Hiroki Morishita (Device/System Group, AIMR, Tohoku University) |
| 25th | Nov. 28, 2025 | Prof. Yusuke Nomura (PI of AIMR, Tohoku University) |
| 24th | Oct. 31, 2025 | Prof. Yuichi Ikuhara (PI of AIMR, Tohoku University) |
| 23rd | Oct. 8, 2025 | Prof. Yasumasa Nishiura (Research Adviser of AIMR, Tohoku University) |
| 22nd | July 22, 2025 | Prof. Yucheng Jiang (Suzhou University of Science and Technology, China) |
| 21st | July 18, 2025 | Prof. Toshiaki Kato (PI of AIMR, Tohoku University) |
| 20th | June 27, 2025 | Dr. Jiayu Peng (University at Buffalo, U.S.A.) |
| 19th | June 20, 2025 | Prof. Bala Krishnamoorthy (Washington State University Vancouver, U.S.A.) |
| 18th | June 6, 2025 | Prof. Tomoki Ozawa (PI of AIMR, Tohoku University) |
| 17th | May 16, 2025 | Dr. Kazutoshi Inoue (Jr. PI of AIMR, Tohoku University) |
| 16th | Apr. 25, 2025 | Prof. Takafumi Sato (PI of AIMR, Tohoku University) |
| 15th | Mar. 26, 2025 | Prof. Shizuo Kaji (Institute of Mathematics for Industry, Kyushu University) |
| 14th | Feb. 28, 2025 | Prof. Fernanda Albana Marchesini (National University of Litoral, Argentine) |
| 13th | Feb. 7, 2025 | Dr. Lewis Conway (University of Cambridge, U.K.) |
| 12th | Jan. 17, 2025 | Dr. Sonia Mahmoudi (SUURI-COOL/Mathematical Science Group, AIMR, Tohoku University) |
| 11th | Jan. 10, 2025 | Prof. Lorenzo Di Bari (University of Pisa, Italy) |
| 10th | Dec. 13, 2024 | Dr. Yuta Yoshimoto (Fujitsu Ltd.) |
| 9th | Nov. 29, 2024 | Prof. Zhiqiang Mao (Pennsylvania State University, U.S.A.) |
| 8th | July 19, 2024 | Dr. Shuai Wei (Aarhus University, Denmark) |
| 7th | July 5, 2024 | Prof. Henning Schomerus (Lancaster University, U.K.) |
| 6th | May 10, 2024 | Prof. Hidekazu Kurebayashi (University College London, U.K.) |
| 5th | May 1, 2024 | Prof. Michael Hirscher (Max-Planck-Institute for Intelligent Systems, Germany) |
| 4th | Apr. 26, 2024 | Prof. Konstantinos Danas (ELyTMax, CNRS-Tohoku University) |
| 3rd | Mar. 13, 2024 | Prof. Ryoko Tomiyasu (Institute of Mathematics for Industry, Kyushu University) |
| 2nd | Jan. 26, 2024 | Prof. Michael I. Ojovan (Imperial College London, U.K.) |
| 1st | Jan. 12, 2024 | Dr. William Chuck Witt (University of Cambridge, U.K.) |
About Tea Time Talk
As part of an event during Friday Tea Time, AIMR has been hosting lectures by famed researchers and the archives up to 2023 are listed below:
| 43rd | July 21, 2023 | Prof. Feral Temelli (University of Alberta, Canada) |
|---|---|---|
| 42nd | June 30, 2023 | Dr. Douglas Brumley (The University of Melbourne, Australia) |
| 41st | Mar. 28, 2023 | Prof. Motomu Tanaka (Physical Chemistry of Biosystems, Institute of Physical Chemistry, Heidelberg University, Germany) |
| 40th | Nov. 10, 2022 | Prof. Masahiro Yoshimura (National Cheng Kung University, Taiwan) |
| 39th | June 17, 2022 | Prof. Rana Mohtadi (Toyota Research Institute of North America) |
| 38th | June 17, 2022 | Prof. Michael Hirscher (Max-Planck-Institute for Intelligent Systems, Germany) |
| 37th | June 3, 2022 | Prof. Reiko Oda (French National Centre for Scientific Research) |
| 36th | May 28, 2021 | Prof. Magda Titirici (Imperial College London, U.K.) |
| 35th | Mar. 26, 2021 | Prof. Yaroslav Blanter (Kavli Institute of Nanoscience, Delft University of Technology) |
| 34th | Oct. 23, 2020 | Dr. Kazuhito Tsukagoshi (PI:WPI-MANA, NIMS & AIMR) |
| 33rd | July 17, 2020 | Prof. Kaoru Tamada (IMCE, Kyushu University & AIMR) |
| 32nd | Jan. 17, 2020 | Prof. Miho Yamauchi (I2CNER / Kyushu University & AIMR) |
| 31st | Jan. 17, 2020 | Prof. Mickaël Lallart (INSA Lyon, Université de Lyon) |
| 30th | Oct. 25, 2019 | Assoc. Prof. Frédéric Gillot (Department of Solid Mechanics, Mechanical Eng. and Civil Eng., École Centrale de Lyon) |
| 29th | July 12, 2019 | Prof. Qian Niu (Department of Physics, The University of Texas at Austin) |
| 28th | May 17, 2019 | Prof. Damien Fabrègue (INSA Lyon, France / ELyT MaX Lab at Tohoku University) |
| 27th | Dec. 14, 2018 | Prof. Yukitoshi Motome (Department of Applied Physics, The University of Tokyo, Japan) |
| 26th | July 13, 2018 | Dr. Shimpei Ono (Central Research Institute of Electric Power Industry, Japan) |
| 25th | May 11, 2018 | Dr. Pierre-Antoine Geslin (Mateis lab, INSA Lyon/CNRS / ELyTMaX Lab at Tohoku University / Institute for Materials Research, Tohoku University) |
| 24th | Apr. 27, 2018 | Prof. Masaru Tsukada (AIMR, Tohoku University) |
| 23rd | Dec. 8, 2017 | Prof. Jean-Yves Cavaillé (INSA Lyon, France / ELyT MaX Lab at Tohoku University) |
| 22nd | July 28, 2017 | Prof. Nicolas Mary (INSA Lyon, France / ELyT MaX Lab at Tohoku University) |
| 21st | July 21, 2017 | Prof. Gael Sebald (INSA Lyon, France / ELyT MaX at Tohoku University) |
| 20th | July 7, 2017 | Prof. Arun Bansil (Northeastern University) |
| 19th | June 30, 2017 | Dr. Takeshi Nakanishi (AIST-Tohoku U Mathematics for Advanced Materials Open Innovation Laboratory (MathAM-OIL)) |
| 18th | June 23, 2017 | Prof. Denis Arčon (Jožef Stefan Institute, Slovenia) |
| 17th | Apr. 28, 2017 | Prof. Ayumi Hirano (AIMR, Tohoku University) |
| 16th | Nov. 29, 2016 | Dr. David Guy Austing (National Research Council Canada, Canada) |
| 15th | Sept. 30, 2016 | Prof. C. Suryanarayana (University of Central Florida, U.S.A.) |
| 14th | June 17, 2016 | Prof. Tomoteru Fukumura (AIMR, Tohoku University) |
| 13th | May 13, 2016 | Prof. Jean-Yves Cavaillé (ELyT MaX (Joint Lab at Tohoku University), University of Lyon, France) |
| 12th | June 26, 2015 | Dr. B. Muralidharan (Indian Institute of Technology Bombay, India) |
| 11th | June 27, 2014 | Prof. Michael B. Santos (The University of Oklahoma, U.S.A.) |
| 10th | Nov. 19, 2013 | Dr. Pawel Hawrylak (National Research Council Canada, Canada) |
| 9th | Oct. 1, 2013 | Dr. Yuan T. Lee (Nobel laureate in Chemistry, Academia Sinica of Taiwan) |
| 8th | June 28, 2013 | Dr. Bjorn Mysen (Geophysical Laboratory, Carnegie Institution for Science, U.S.A.) |
| 7th | Apr. 12, 2013 | Prof. Yiming Li (National Chiao Tung University, Taiwan) |
| 6th | Jan. 18, 2013 | Prof. Tomasz Dietl (Polish Academy of Sciences, Poland) |
| 5th | Aug. 31, 2012 | Prof. John H. Perepezko (University of Wisconsin-Madison, U.S.A.) |
| 4th | Aug. 17,2012 | Prof. Alain Reza Yavari (Grenoble Institute of Technology, France) |
| 3rd | Aug. 10, 2012 | Prof. Alan Lindsay Greer (University of Cambridge, U.K.) |
| 2nd | July 6, 2012 | Prof. Winfried Teizer (Texas A&M University, U.S.A.) |
| 1st | May 25, 2012 | Prof. Thomas P. Russell (The University of Massachusetts Amherst, U.S.A.) |