The cooperative migration dynamics of particles correlates to the nature of hexatic-isotropic phase transition in 2D systems of corner-rounded hexagons

Zhanglin Hou ¹Mingwei Liu ²Yiwu Zong ²Fangfu Ye ³Kun Zhao⁴

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作者信息

1. Wenzhou Institute,University of Chinese Academy of Sciences,Wenzhou,Zhejiang 325001,China;Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering(Ministry of Education),School of Chemical Engineering and Technology,Tianjin 300072,China;School of Physical Science,University of Chinese Academy of Sciences,Beijing 100049,China
2. Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering(Ministry of Education),School of Chemical Engineering and Technology,Tianjin 300072,China
3. Wenzhou Institute,University of Chinese Academy of Sciences,Wenzhou,Zhejiang 325001,China;School of Physical Science,University of Chinese Academy of Sciences,Beijing 100049,China;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;Oujiang Laboratory(Zhejiang Lab for Regenerative Medicine,Vision and Brain Health),Wenzhou,Zhejiang 325001,China
4. Sichuan Provincial People's Hospital,University of Electronic Science and Technology of China,Chengdu,Sichuan 610054,China;Institute of Fundamental and Frontier Sciences,University of Electronic Science and Technology of China,Chengdu,Sichuan 610054,China
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Abstract

In the two-dimensional(2D)melting transition of colloidal systems,the hexatic-isotropic(H-I)transition can be either first-order or continuous.However,how particle dynamics differs at the single-particle level during these two different melting transitions remains to be disclosed.In this work,by Brownian dynamics(BD)simulations,we have systematically studied the dynamic behavior of corner-rounded hexagons during the H-I transition,for a range of corner-roundness ζ=0.40 to 0.99 that covers the crossover from the continuous to first-order nature of H-I transition.The results show that hexagons with ζ ≤ 0.5 display a continuous H-I transition,whereas those with ζ ≥ 0.6 demonstrate a first-order H-I transition.Dynamic analysis shows different evolution pathways of the dominant cluster formed by migrating particles,which results in a droplet-like cluster structure for ζ=0.40 hexagons and a tree-like cluster structure for ζ=0.99 hexagons.Further investigations on the hopping activities of particles suggest a cooperative origin of migrating clusters.Our work provides a new aspect to understand the dependence of the nature of H-I transition on the roundness of hexagons through particle dynamic behavior.

Key words

Melting transition/Colloids/Hexatic phase/Cooperative migration/Hexagons

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基金项目

国家自然科学基金(11874277)

国家自然科学基金(21621004)

国家自然科学基金(12104453)

中国科学院战略规划重点项目(XDB33030300)

出版年

2024

自然科学基础研究(英文)

CSTPCD

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参考文献量41

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