東京科学大学 理学院 物理学系
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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