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Title: Attraction tames two-dimensional melting : from continuous to discontinuous transitions
Authors: Li, Yan-Wei
Ciamarra, Massimo Pica
Keywords: Physics - Soft Condensed Matter
Physics - Soft Condensed Matter
Physics - Statistical Mechanics
Issue Date: 2020
Source: Li, Y-W., & Ciamarra, M. P. (2020). Attraction tames two-dimensional melting : from continuous to discontinuous transitions. Physical Review Letters, 124(21), 218002-. doi:10.1103/PhysRevLett.124.218002
Project: MOE2017-T2-1-066
Journal: Physical Review Letters 
Abstract: Two-dimensional systems may admit a hexatic phase and hexatic-liquid transitions of different natures. The determination of their phase diagrams proved challenging, and indeed, those of hard disks, hard regular polygons, and inverse power-law potentials have only recently been clarified. In this context, the role of attractive forces is currently speculative, despite their prevalence at both the molecular and colloidal scale. Here, we demonstrate, via numerical simulations, that attraction promotes a discontinuous melting scenario with no hexatic phase. At high-temperature, Lennard-Jones particles and attractive polygons follow the shape-dominated melting scenario observed in hard disks and hard polygons, respectively. Conversely, all systems melt via a first-order transition with no hexatic phase at low temperature, where attractive forces dominate. The intermediate temperature melting scenario is shape dependent. Our results suggest that, in colloidal experiments, the tunability of the strength of the attractive forces allows for the observation of different melting scenarios in the same system.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.124.218002
Rights: © 2020 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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