[セミナー］第49回IPBセミナーを開催します。

[セミナー］第49回IPBセミナーを開催します。
日時：2024年3月11日(月)11:00-
場所：東大本郷キャンパス理学部1号館512室　hybrid開催
講演者：Andreas Menzel氏 (マグデブルク大)
title：Individual and collective motion of chiral, regularly organized, and nematic active objects
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https://lab.kaztake.org/data/seminar/html/index-j.html

　Actively propelled objects span a broad variety of actual realizations, from self-propelled bacteria, via vibrated hoppers, to animals and humans. Besides being equipped with a propulsion mechanism, all of these entities share a common feature. There is, ad hoc, no outside mechanism that rigidly dictates their propulsion direction. Instead, they have the freedom to select this direction, even if only through rotational stochastic processes. We here address different scenarios of corresponding systems. First, we address chiral objects that show bent trajectories, move in discrete steps, and tend to head towards a remote target, which leads to pronounced nonlinear dynamics [1]. Next, we consider self-propelling units organized in regular lattice structures, which leads to the onset of collective motion beyond a threshold active drive, while chirality can make collective motion break down [2]. Third, we address nematic actively propelled entities that stochastically reverse their propagation direction, where a formal analogy to a basic quantum mechanical problem is revealed during the analysis of the associated statistics [3]. Overall, we hope to stimulate experimental realizations and investigations of such systems.

[1] A. M. Menzel, Phys. Rev. E 106, 064603 (2022).
[2] Z.-F. Huang, A. M. Menzel, H. Löwen, Phys. Rev. Lett. 125, 218002 (2020).
[3] A. M. Menzel, J. Chem. Phys. 157, 011102 (2022) – Featured Communication.