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Title: Phase behavior of Lennard-Jones particles in two dimensions
Authors: Li, Yan-Wei
Ciamarra, Massimo Pica
Keywords: Science::Physics
Issue Date: 2020
Source: Li, Y.-W., & Ciamarra, M. P. (2020). Phase behavior of Lennard-Jones particles in two dimensions. Physical Review E, 102(6), 062101-. doi:10.1103/physreve.102.062101
Project: MOE2017-T2-1-066 (S)
Journal: Physical Review E
Abstract: The phase diagram of the prototypical two-dimensional Lennard-Jones (LJ) system, while extensively investigated, is still debated. In particular, there are controversial results in the literature with regard to the existence of the hexatic phase and the melting scenario. Here we study the phase behavior of two-dimensional range-limited LJ particles via large-scale numerical simulations. We demonstrate that at a high temperature, when the attraction in the potential plays a minor role, melting occurs via a continuous solid-hexatic transition followed by a first-order hexatic-fluid transition. The hexatic phase occurs in a density range that vanishes as the temperature decreases so that at low-temperature melting occurs via a first-order liquid-solid transition. The temperature where the hexatic phase disappears is well above the liquid-gas critical temperature. The evolution of the density of topological defects confirms this scenario.
ISSN: 2470-0045
DOI: 10.1103/PhysRevE.102.062101
Rights: © 2020 American Physical Society (APS). All rights reserved. This paper was published in Physical Review E and is made available with permission of American Physical Society (APS).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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