東京科学大学理学院物理学系
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2026.10.22

Harnessing Light to Generate and Probe Magnons in Two-Dimensional Magnets

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

研究成果
2026.10.21

目詰まり現象に潜む共通の原理を解明

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

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

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