Spontaneous generation of angular momentum in chiral active crystals

IF 2.9 3区 化学 Q3 CHEMISTRY, PHYSICAL
Soft Matter Pub Date : 2025-02-26 DOI:10.1039/D4SM01426J
Umberto Marini Bettolo Marconi and Lorenzo Caprini
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引用次数: 0

Abstract

We study a two-dimensional chiral active crystal composed of underdamped chiral active particles. These particles, characterized by intrinsic handedness and persistence, interact via linear forces derived from harmonic potentials. Chirality plays a pivotal role in shaping the system's behavior: it reduces displacement and velocity fluctuations while inducing cross-spatial correlations among different Cartesian components of velocity. These features distinguish chiral crystals from their non-chiral counterparts, leading to the emergence of net angular momentum, as predicted analytically. This angular momentum, driven by the torque generated by the chiral active force, exhibits a non-monotonic dependence on the degree of chirality. Additionally, it contributes to the entropy production rate, as revealed through a path-integral analysis. We investigate the dynamic properties of the crystal in both Fourier and real space. Chirality induces a non-dispersive peak in the displacement spectrum, which underlies the generation of angular momentum and oscillations in time-dependent autocorrelation functions or mean-square displacement, all of which are analytically predicted.

Abstract Image

手性活性晶体中角动量的自发产生。
研究了由欠阻尼手性活性粒子组成的二维手性活性晶体。这些粒子具有固有的手性和持久性,它们通过谐波势产生的线性力相互作用。手性在形成系统行为方面起着关键作用:它减少了位移和速度波动,同时诱导了不同笛卡尔速度分量之间的跨空间相关性。这些特征将手性晶体与非手性晶体区分开来,导致净角动量的出现,正如分析预测的那样。该角动量由手性主动力产生的转矩驱动,与手性的程度呈非单调关系。此外,它有助于熵产率,通过路径积分分析揭示。我们研究了晶体在傅里叶空间和实空间中的动态特性。手性在位移谱中引起一个非色散峰,这是产生角动量和时变自相关函数或均方位移振荡的基础,所有这些都是解析预测的。
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来源期刊
Soft Matter
Soft Matter 工程技术-材料科学:综合
CiteScore
6.00
自引率
5.90%
发文量
891
审稿时长
1.9 months
期刊介绍: Soft Matter is an international journal published by the Royal Society of Chemistry using Engineering-Materials Science: A Synthesis as its research focus. It publishes original research articles, review articles, and synthesis articles related to this field, reporting the latest discoveries in the relevant theoretical, practical, and applied disciplines in a timely manner, and aims to promote the rapid exchange of scientific information in this subject area. The journal is an open access journal. The journal is an open access journal and has not been placed on the alert list in the last three years.
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