東京科学大学理学院物理学系
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セミナー

2026.10.20

Nucleosynthesis in Astrophysical Explosions and Galactic Chemical Evolution

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

セミナー

2026.10.20

Pushing the limits of density-functional theory for accurate and predictive simulations of complex materials

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

セミナー

2026.10.20

Analytic structure of quantum resonances via exact WKB, scattering theory, and complex scaling

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

研究成果
2026.10.19

NMRと輸送測定で明らかにした抵抗スイッチングの熱的自己組織化

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。

セミナー

2026.10.13

Non-Classical Chirality of Macromolecular Systems: Functions of Disordered and Non-uniform Polymers

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

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