今月中締切の記事
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セミナー
2026.10.27
講師：Professor Manfred Fiebig
（Department of Materials, ETH Zurich, Switzerland
Department of Physics, Kyoto University, Japan）
日時：令和8年10月30日（金）15:30-
場所：南5号館1階 103B 第2会議室Systems with strong electronic correlations lead to a fascinating variety of phenomena such as novel types of ferroic order, multiferroicity, superconductance, colossal magnetoresistance and much more. Well-established characterization methods are at our disposal for creating and investigating these states of matter, including, for example, pulsed-laser deposition for the former and photonic techniques for the latter. In my talk, I will focus on the interplay of quantum materials and nonlinear laser spectroscopy between terahertz and optical frequencies. Laser pulses can be used either to monitor ferroic states with spatial (domains) or temporal (dynamics) resolution. On the other hand, strong light pulses can manipulate the ordered state as such and even induce phase transitions. I will give a survey of our activities in the hope of stimulating future discussion and possibly exchange of visitors. 連絡教員：物理学系 佐藤 琢哉（内線2716）
https://www.phys.sci.isct.ac.jp/wp/wp-content/uploads/2026/10/125tokubetsu.pdf
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セミナー
2026.10.23
講師：永田 夏海 氏（東京大学 大学院理学系研究科)
日時：令和8年12月4日（金）16:00-
場所：本館2階 290 物理学系輪講室素粒子標準模型を超対称性を持つように拡張した超対称標準模型において、ヒッグス粒子の超対称パートナーであるヒッグシーノは、特に重要な役割を果たす。ヒッグシーノの質量は電弱対称性の破れや電弱スケールの自然性問題と密接に関係しており、また、ヒッグシーノ自身が暗黒物質の有力な候補にもなり得る。しかしながら、現在の実験によるヒッグシーノの探索は十分に進んでおらず、依然として広い質量領域が未探索のまま残されている。本セミナーでは、LHCおよび暗黒物質直接探索実験によるヒッグシーノ探索の現状を概観するとともに、将来実験による探索の可能性について議論する。特に、次世代電子・陽電子衝突型加速器における電弱精密測定を通じて、ヒッグシーノの存在をどこまで探ることができるかを紹介する。
※「物理学特別講義（発展）第十四」を履修する学生は本セミナーも聴講すること。連絡教員：物理学系 陣内 修（内線2081）
https://www.phys.sci.isct.ac.jp/wp/wp-content/uploads/2026/10/457.pdf
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セミナー
2026.10.22
講師：Professor Silvia Viola Kusminskiy（RWTH Aachen University, Germany)
日時：令和8年11月25日（水）15:30-
場所：南5号館5階 503CD 大会議室Two-dimensional magnetic materials provide a versatile platform for controlling collective spin excitations and exploring their topological and quantum-geometric properties. Of particular interest is the generation and manipulation of magnon spin currents, which could enable low-dissipation information transport, while topological magnons offer the prospect of robust, directional spin transport protected against imperfections. Beyond topology, the quantum geometry of magnon bands contains information about the magnon wavefunctions that is inaccessible from the excitation spectrum alone, providing a new avenue for characterizing magnetic materials. In this talk, I will discuss how light can be used both to control and to probe these phenomena. I will present mechanisms for the all-optical generation of magnon spin currents [1], as well as optical approaches to access the topology and quantum geometry of magnon bands [2, 3]. Combined with an optical cavity, these mechanisms can be leveraged to generate steady states of squeezed magnon pairs [4]. Finally, I will discuss how THz spectroscopy and cavity coupling can reveal signatures of topological magnon edge states [5]. Together, these theoretical results demonstrate how light–magnon interactions provide powerful tools to generate, probe, and characterize magnon transport and collective excitations in two-dimensional magnetic materials.
References:
[1] E. Viñas Boström, T. S. Parvini, J. W. McIver, A. Rubio, S. Viola Kusminskiy, M. A. Sentef; Phys. Rev. B 104, L100404 (2021)
[2] E. Viñas Boström, T. S. Parvini, J. W. McIver, A. Rubio, S. Viola Kusminskiy, M. A. Sentef; Phys. Rev. Lett. 130, 026701 (2023)
[3] Y.-S. Liu, E. Viñas Boström, M. A. Sentef, S. Viola Kusminskiy; arXiv:2604.11931 (2026)
[4] T. S. Parvini, A.-L. E. Römling, S. Sharma, S. Viola Kusminskiy; Phys. Rev. B 111, 014416 (2025)
[5] I. Mohanty, J. Knolle, S. Viola Kusminskiy; arXiv:2607.23170 (2026)連絡教員：物理学系 佐藤 琢哉（内線2716）
https://www.phys.sci.isct.ac.jp/wp/wp-content/uploads/2026/10/456.pdf
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研究成果
2026.10.21
https://www.isct.ac.jp/ja/news/ie0bdgksclyn
東京科学大学（Science Tokyo）理学院 物理学系の嶺村貴秀大学院生（研究当時、東京工業大学修士課程）と大熊哲名誉教授の研究チームは、身の回りで広く見られる流れの目詰まり現象が、非平衡相転移であることを初めて実験的に証明しました。本研究の成果は、日常生活に遍在する目詰まり現象の統一的理解と、社会的要請の強い “目詰まりの予測と制御” にもつながると期待されます。
本成果は、9月25日付（英国現地時間）の科学誌「Communications Physics」誌に掲載されました。 -
セミナー
2026.10.20
講師：Dr. Nobuya Nishimura（工学院大学、教育支援機構、学習支援センター)
日時：令和8年11月16日（月）16:00-
場所：本館2階 227B 物理学系輪講室I will first provide a brief overview of the nucleosynthesis processes responsible for producing elements heavier than iron in the Universe, from the perspectives of astrophysics and nuclear physics. I will particularly emphasize how recent nucleosynthesis studies are closely connected to cutting-edge research topics in astrophysics and fundamental physics, including nuclear physics. Building on this background, I will present recent research on r-process nucleosynthesis in explosive astrophysical environments. Particular emphasis will be placed on nuclear physics uncertainties, alongside recent advances in astrophysical modeling. Furthermore, I will discuss several issues related to the chemical evolution of galaxies, focusing on how elements produced in astrophysical explosions are supplied to galaxies and subsequently contribute to the formation of new generations of stars and planets. 連絡教員：物理学系 関澤 一之（内線2463）
https://www.phys.sci.isct.ac.jp/wp/wp-content/uploads/2026/10/455.pdf
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セミナー
2026.10.20
講師：本橋 隼人 准教授（東京都立大学 大学院理学研究科)
日時：令和8年11月16日（月）13:30-
場所：本館1階 M-112講義室Gravitational waves emitted by perturbed black holes provide a macroscopic realization of non-Hermitian wave dynamics: they either fall irreversibly into the event horizon or escape to infinity. This two-sided open boundary condition discretizes characteristic damped oscillations known as quasinormal modes, which appear as the “ringdown” phase in the gravitational waves observed from binary black-hole mergers. Despite this natural setup, the connection between non-Hermitian physics and black-hole gravitational waves has only recently come into focus. In this talk, I will give an overview of black-hole physics from the viewpoint of non-Hermitian wave dynamics, highlighting recent findings involving eigenvalue avoided crossings and resonantly amplified mode excitation near exceptional points: an effect that resolves a thirty-year mystery in gravitational-wave physics [1].
[1] H. Motohashi, Phys. Rev. Lett. 134, 141401 (2025), [arXiv:2407.15191].連絡教員：物理学系 藤井 啓資（内線2136）
https://www.phys.sci.isct.ac.jp/wp/wp-content/uploads/2026/10/124tokubetsu.pdf
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セミナー
2026.10.20
講師：Dr. Iurii Timrov（PSI Center for Scientific Computing, Theory and Data, Switzerland)
日時：令和8年11月9日（月）16:00-
場所：本館2階 227B 物理学系輪講室Density-functional theory (DFT) is one of the most widely used first-principles theoretical frameworks for understanding and predicting the properties of materials. For systems containing localized electronic states, Hubbard-corrected functionals provide an efficient extension of DFT that can substantially improve the description of electronic structure, energetics, and magnetic properties. In this seminar, I will present a decade of theoretical developments aimed at making Hubbard-corrected DFT more predictive, systematic, and broadly applicable. I will introduce our approach for calculating on-site U and inter-site V Hubbard parameters self-consistently and from first principles using density-functional perturbation theory [1,2,3]. I will discuss how these developments have been incorporated into DFT+U and DFT+U+V and implemented in the open-source Quantum ESPRESSO suite [4]. I will then illustrate applications to a range of problems in condensed matter and materials physics, including transition-metal oxides, battery materials, defects in perovskites, and photocatalysts. Examples will cover structural and electronic properties, voltages, formation energies, band gaps, and magnetic properties, with comparisons between theoretical predictions and available experimental results. Finally, I will discuss recent extensions of these approaches beyond static ground-state calculations, including lattice dynamics, electron-phonon coupling, and magnetic excitations. Throughout the talk, I will emphasize the theoretical foundations of the methods, their practical implementation, and the connection between computational predictions and experimentally measurable properties. The goal is to provide a perspective on how systematic developments of Hubbard functionals can turn DFT-based calculations into more reliable quantitative tools for studying complex materials.
[1] I. Timrov, N. Marzari, M. Cococcioni, Phys. Rev. B 98, 085127 (2018).
[2] I. Timrov, N. Marzari, M. Cococcioni, Phys. Rev. B 103, 045141 (2021).
[3] I. Timrov, N. Marzari, M. Cococcioni, Comput. Phys. Commun. 279, 108455 (2022).
[4] P. Giannozzi et al., J. Phys.: Condens. Matter 29, 465901 (2017).連絡教員：物理学系 平原 徹（内線2365）
https://www.phys.sci.isct.ac.jp/wp/wp-content/uploads/2026/10/454.pdf
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セミナー
2026.10.20
講師：森川 億人 氏（理化学研究所 数理創造研究センター（iTHEMS））
日時：令和8年11月9日（月）13:30-
場所：本館1階 M-112講義室Quantum resonances appear in a wide range of physical systems as metastable states embedded in, or coupled to, a continuum. While they are commonly characterized as poles of the scattering matrix at complex energies, their relation to wave functions, boundary conditions, and the continuum spectrum is more subtle than in ordinary bound-state problems.
In this seminar, I will discuss quantum resonances from the viewpoint of analytic continuation and complex spectral theory. After reviewing the basic connection between resonant states, outgoing boundary conditions, and poles of the scattering amplitude, I will introduce the exact WKB method as a useful framework for analyzing resonances nonperturbatively through the analytic structure of wave functions in the complex plane. I will then explain how complex scaling provides a complementary description in which resonant states can be treated as discrete eigenstates separated from the rotated continuum.
Using simple one-dimensional examples, I will illustrate how exact WKB, scattering theory, and complex scaling provide mutually consistent descriptions of resonance energies, decay widths, and continuum states. I will also comment on possible connections to non-Hermitian physics and resonance phenomena in many-body and condensed-matter systems.連絡教員：物理学系 藤井 啓資（内線2136）
https://www.phys.sci.isct.ac.jp/wp/wp-content/uploads/2026/10/453.pdf
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研究成果
2026.10.19
https://www.isct.ac.jp/ja/news/5nnixlz6wpkc
東京科学大学（Science Tokyo） 理学院 物理学系の賀川 史敬教授（理化学研究所 創発物性科学研究センター（CEMS） 動的創発物性研究チーム チームディレクター）、東京理科大学 先進工学部 物理工学科の伊藤 哲明教授、小内 貴祥助教、同大学大学院 先進工学研究科 物理工学専攻の石井 璃空氏（2024年度 修士課程修了）、物質・材料研究機構（NIMS） ナノアーキテクトニクス材料研究センターの大池 広志主任研究員、理化学研究所 開拓研究所（PRI） Kim表面界面科学研究室の加藤 礼三研究員らの共同研究グループは、有機伝導体 (d7-DMe-DCNQI)2Cuの抵抗スイッチング状態[用語1]において、金属相と絶縁相が共存することをバルクに敏感な1H-NMR測定により明らかにしました。
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セミナー
2026.10.13
講師：中野 環 教授（北海道大学 触媒科学研究所）
日時：令和8年10月23日（金）15:30-
場所：南5号館1階 103B 第2会議室Ordering molecular and inter-molecular, uniform structures is recognized as important in attaining functionality of a wide range of organic and inorganic materials. On the other hand, we have found several cases in polymer science where disorder and non-uniformity play a role in attaining functionalities. One example is a chiral hyperbranched polyfluorenevinylene designed with inspiration from the fact that optically active natural polymers are often produced in hyperbranched forms, as exemplified by amylopectin and glycogen [1]. This polymer can form an inclusion complex with a large excess of external aromatic molecules without the formation of single crystals of the included molecules, and the amorphous inclusion system exhibits circularly polarized light (CPL) emission at a high anisotropy.
Another example is a chiral linear polyfluorenevinylene having single-handed helical conformation. This polymer bends its chain to form “turns” in the middle of chain, not in the vicinity of chain, and folds into a non-uniform structure in solution. Further, the polymer exhibits efficient CPL emission arising from the turn moieties [2]. These observations may imply that useful functionalities may be attained without relying on classical, highly regulated and uniform chiral structures of polymers represented by helix, as far as polymers are concerned [3]. It is worth investigating whether disordered and non-uniform structures play a role in materials science aiming at specific functions.
[1] Wu P, Pietropaolo A, Fortino M, Bando M, Maeda K, Nishimura T, Shimoda S, Sato H, Naga N, Nakano T, Angew Chem Int Ed. 2023, e202305747.
[2] Wang Q, Son K, Pietropaolo A, Fortino M, Ogasawara M, Ohji T, Shimoda S, Bando M, Nakano T. Chem Eur J. 2024, 30, e202304275-e202304275.
[3] T. Nakano, M. Bando, A. Xing and N. Naga, ChemistryEurope, 2026, 4, e202500449.連絡教員：物理学系 佐藤 琢哉（内線2716）
https://www.phys.sci.isct.ac.jp/wp/wp-content/uploads/2026/10/452.pdf