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Solid-to-molecular-orientational-hexatic melting induced by local environment determined defect proliferations |
| Zhanglin Hou(侯章林)1,2,3,†,‡, ‡1,†, Jieli Wang(王杰利)4, Ying Zeng(曾颖)1,3, Zhiyuan Zhao(赵志远)1,3, Xing Huang(黄兴)5,6,§, Kun Zhao(赵坤)1,3,7,8,9,¶ |
1 Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325001, China;
2 Key Laboratory of Systems Bioengineering(Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
3 School of Physical Science, University of Chinese Academy of Sciences, Beijing 100049, China;
4 Research Center of Computational Physics, School of Mathematics and Physics, Mianyang Teachers'College, Mianyang 621000, China;
5 Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu 610054, China;
6 Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China;
7 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
8 Songshan Lake Materials Laboratory, Dongguan 523808, China;
9 Oujiang Laboratory(Zhejiang Laboratory for Regenerative Medicine, Vision and Brain Health), Wenzhou 325001, China |
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Abstract Two-dimensional (2D) melting is a fundamental research topic in condensed matter physics, which can also provide guidance on fabricating new functional materials. Nevertheless, our understanding of 2D melting is still far from being complete due to existence of possible complicate transition mechanisms and absence of effective analysis methods. Here, using Monte Carlo simulations, we investigate 2D melting of 60° rhombs which melt from two different surface-fully-coverable crystals, a complex hexagonal crystal (cHX) whose primitive cell contains three rhombs, and a simple rhombic crystal (RB) whose primitive cell contains one rhomb. The melting of both crystals shows a sequence of solid, hexatic in molecular orientation (Hmo), and isotropic phases which obey the Berezinskii-Kosterlitz-Thouless-Halperin-Nelson-Young (BKTHNY) theory. However, local polymorphic configuration (LPC) based analysis reveals different melting mechanisms: the cHX-Hmo transition is driven by the proliferation of point-like defects during which defect-associated LPCs are generated sequentially, whereas the RB-Hmo transition is driven by line defects where defect-associated LPCs are generated simultaneously. These differences result in the observed different solid-Hmo transition points which are φA=0.812 for the cHX-Hmo and φA=0.828 for the RB-Hmo. Our work will shed light on the initial-crystal-dependence of 2D melting behavior.
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Received: 28 May 2022
Revised: 26 July 2022
Accepted manuscript online: 26 August 2022
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PACS:
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64.60.-i
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(General studies of phase transitions)
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64.60.Cn
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(Order-disorder transformations)
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05.10.Ln
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(Monte Carlo methods)
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05.70.Fh
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(Phase transitions: general studies)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11874277, 21621004, 12104453, and 12090054) and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB33030300). |
Corresponding Authors:
Zhanglin Hou, Kun Zhao, Fangfu Ye
E-mail: zl_hou@tju.edu.cn;kzhao@uestc.edu.cn;fye@iphy.ac.cn
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Cite this article:
Zhanglin Hou(侯章林), Jieli Wang(王杰利), Ying Zeng(曾颖), Zhiyuan Zhao(赵志远), Xing Huang(黄兴), Kun Zhao(赵坤), and Fangfu Ye(叶方富) Solid-to-molecular-orientational-hexatic melting induced by local environment determined defect proliferations 2022 Chin. Phys. B 31 126401
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