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Solid-to-molecular-orientational-hexatic melting induced by local environment determined defect proliferations

Chinese Physics B 2022年第12期31卷 396-403页

作者： Zhanglin Hou Jieli Wang Ying Zeng Zhiyuan Zhao Xing Huang Kun Zhao Fangfu Ye Wenzhou Institute University of Chinese Academy of SciencesWenzhou 325001China Key Laboratory of Systems Bioengineering(Ministry of Education) School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China School of Physical Science University of Chinese Academy of SciencesBeijing 100049China Research Center of Computational Physics School of Mathematics and PhysicsMianyang Teachers’CollegeMianyang 621000China Sichuan Provincial People’s Hospital University of Electronic Science and Technology of ChinaChengdu 610054China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China Oujiang Laboratory(Zhejiang Laboratory for Regenerative Medicine Vision and Brain Health)Wenzhou 325001China

two-dimensional(2D)melting is a fundamental research topic in condensed matter physics,which can also provide guidance on fabricating new functional ***,our understanding of 2D melting is still far from being complete due to existence of possible complicate transition mechanisms and absence of effective analysis ***,using Monte Carlo simulations,we investigate 2D melting of 60°rhombs which melt from two different surface-fullycoverable crystals,a complex hexagonal crystal(cHX)whose primitive cell contains three rhombs,and a simple rhombic crystal(RB)whose primitive cell contains one *** 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)***,local polymorphic configuration(LPC)based analysis reveals different melting mechanisms:the cHX-Hmotransition is driven by the proliferation of point-like defects during which defect-associated LPCs are generated sequentially,whereas the RB-Hmotransition is driven by line defects where defect-associated LPCs are generated *** differences result in the observed different solid-Hmotransition points which areφA=0.812 for the cHX-HmoandφA=0.828 for the *** work will shed light on the initial-crystal-dependence of 2D melting behavior.

关键词： two-dimensional melting phase transition molecular-orientational forming liquid crystal local environment melting mechanism

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