ArticleiScience2025
Observing one-step melting pathway in two-dimensional hard circular particle system.
Article in iScience, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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9 authors.
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Abstract
The nature of two-dimensional melting remains a matter of debate. Based on Langevin dynamics simulation, we present a surprising observation that the melting pathway of hard circular-particles/disks is relevant to the dynamical properties of particles. Using hard circular-particles/disks, where particle friction is proportional to particle size, results show the melting pathway of small size particles obeys two-step scenario, consistent with previous reports on melting behavior of hard disks. Conversely, in large size particle systems, we observe a one-step melting pathway. Further investigation reveals that the emergent one-step melting pathway is non-equilibrium phase transition that relates to cooperative relaxation of cage dynamics. This originates from the particularly stable/stiff configuration in large size particle system, which is a metastable state arrested by changed dynamics of particles, thus inducing a non-equilibrium melting pathway that distinguishes from the equilibrium melting behavior. Our findings shed light on the debate on melting behavior of hard disks.
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