One-dimensional models are a theoretical playground for the investigation of strongly interacting many-body dynamics that have in recent years become experimentally realizable. While mean-field methods and other standard approaches are not applicable, they can often be investigated with techniques of integrability and generalized hydrodynamics that have revolutionized our understanding of their large-scale behavior. Fluctuations around hydrodynamic values display remarkable robustness and have recently been observed to be anomalous, indicating additional processes besides normal diffusion.
We study a family of cellular automata with ballistically propagating charged particles and stochastic scattering. By mapping the dynamics to a “vacancy-dressed” stochastic six-vertex model we derive the exact anomalous distribution of the charge current. Building on macroscopic fluctuation theory, we also give a hydrodynamic description of the model’s anomalous fluctuations. Linear degeneracy arising from charge inertness allows for simultaneous contributions from convective and normal diffusion. 
Similar phenomenology of dynamical criticality is observed in equilibrium spin current fluctuations in the easy-axis and isotropic regimes of the XXZ spin chain. The easy-axis regime supports the non-Gaussian distribution of the charged single-file class despite not manifestly satisfying a kinetic constraint. We argue anomalous fluctuations instead arise due to linear degeneracy of the vacuum polarization in the quasi-particle description. At the Heisenberg point the spin structure factor matches that of the Kardar-Parisi-Zhang universality class while spin fluctuations are anomalous but distinct from those of the KPZ class. 

連絡教員：物理学系　笹本　智弘（内線2736）

https://www.phys.sci.isct.ac.jp/wp/wp-content/uploads/2026/02/435.pdf

日本語 ：https://www.phys.sci.isct.ac.jp/wp/wp-content/uploads/2026/02/koubo_jk_jp_0220.pdf

English ：https://www.phys.sci.isct.ac.jp/wp/wp-content/uploads/2026/02/koubo_jk_en_0220.pdf

令和７年度物理学コース優秀修士論文賞は、古賀 幸太郎さん（関澤研）、柴田 龍之介さん（陣内研）、SINGH SHALIKAさん（宗宮研）、雪竹 大輝さん（西田研）、米田 忠司さん（打田研）、伊能 健太郎さん（賀川研）、武田 稜成さん（納富研）、後藤 稜斗さん（上妻研）、の８名が受賞しました。

https://www.phys.sci.isct.ac.jp/wp/wp-content/uploads/2026/02/令和７年度物理学コース優秀修士論文賞.pdf

https://www.isct.ac.jp/ja/news/l5emy5ibht8b

東京科学大学（Science Tokyo） 理学院 物理学系の福島祥紘大学院生と平原徹教授の研究チームは、物質・材料研究機構の一ノ倉聖主任研究員（研究開始時は東京科学大学 助教）、佐々木泰祐グループリーダーと共同で、トポロジカル表面状態のみに電流が流れる理想的な磁性トポロジカル結晶絶縁体の作成に成功しました。

本成果は、2月9日付（米国東部時間）の「Physical Review Letters」誌にオンライン掲載されました。

日本語 ：https://www.phys.sci.isct.ac.jp/wp/wp-content/uploads/2026/02/koubo_jk_jp_080209.pdf
English ：https://www.phys.sci.isct.ac.jp/wp/wp-content/uploads/2026/02/koubo_jk_en_080209.pdf

https://www.isct.ac.jp/ja/news/1nn0z5m5za9z

東京科学大学（Science Tokyo） 総合研究院 量子航法研究センターの上妻幹旺教授、松井宏樹特任助教、宮澤裕貴特任助教らの研究グループは、名古屋大学 大学院工学研究科 応用物理学専攻の川口由紀教授、東京大学 大学院理学系研究科 物理学専攻の上田正仁教授らと共同で、磁性量子気体中のアインシュタイン=ド・ハース効果^[用語1]の観測を報告しました。

本成果は、1月22日付（米国東部時間）の「Science」誌に掲載されました。

https://www.phys.sci.isct.ac.jp/wp/wp-content/uploads/2025/02/202503　nyuusi.pdf

対面での開催です。内容は物理学コースの全般的説明，入試の説明と研究室訪問です。事前登録は不要です。

This seminar will review experimental searches for the H-dibaryon through various reactions, focusing specifically on the latest results from the J-PARC E42 experiment. This experiment investigates the H-dibaryon near the Lambda Lambda and Xi- p mass thresholds. The E42 has collected thousands of Lambda Lambda production events from (K-, K+) reactions off a 12C target at 1.8 GeV/c. We are on the verge of publishing our results, and this talk will discuss the nature of the H-dibaryon, offering insights into exotic baryon spectroscopy and extending our understanding to further multiquark states.

連絡教員：物理学系　慈道　大介（内線2083）

https://www.phys.sci.isct.ac.jp/wp/wp-content/uploads/2026/01/434.pdf

Standard hydrodynamics serves as a successful macroscopic description of fluid motion, ranging from engineering applications to turbulent flows. However, this framework is inherently deterministic and neglects the fluctuations that inevitably arise due to their underlying atomic structure. In particular, these fluctuations govern fluid phenomena at the mesoscopic scale between the microscopic and macroscopic scales. Fluctuating hydrodynamics extends the classical description by incorporating thermal fluctuations, leading to a more accurate description of such mesoscopic transport phenomena.
Recently, we analyzed the strong non-equilibrium fluctuations exhibited by fluids subjected to uniform gradients, such as single-component fluids under a shear flow or a temperature gradient and multi-component fluids under a concentration gradient [1-3]. These phenomena are one of the most well-established examples requiring a fluctuating hydrodynamic description, having been precisely observed in microgravity experiments. We performed direct numerical simulations (DNS) of the fluctuating hydrodynamic equations, and investigated the properties of energy dissipation and fluid behavior in the inviscid limit. In this seminar, I will present these findings alongside a historical review of the development and analysis of fluctuating hydrodynamics.

[1] HN, and K. Yokota, Phys. Rev. E 111, L063401 (2025)
[2] HN, Y. Minami, and K. Saito, arXiv:2502.15241(2025)
[3] HN, and Y. Minami, arXiv:2511.17851 (2025)

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/2026/01/433ーhenkou.pdf

https://www.isct.ac.jp/ja/news/2cc77j8aqtxa

東京科学大学（Science Tokyo） 理学院 物理学系の竹森颯真大学院生、山本和樹助教、古賀昌久准教授らの研究チームは、粒子の損失や非対称な移動が避けられない「非エルミート系[用語1]」において、フェルミ粒子がつくる例外点[用語2]を伴う新しい超流動[用語3]を理論的に発見しました。

本研究成果は2025年12月23日付の米国物理学会誌「Physical Review Letters（フィジカルレビューレターズ）」にオンライン掲載されました。