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Melting of a two-dimensional monodisperse cluster crystal to a cluster liquid
Wenlong Wang1, Rogelio Díaz-Méndez1, Mats Wallin1
1Department of Physics, Royal Institute of Technology, Stockholm SE-106 91, Sweden.
Abstract:
Monodisperse ensembles of particles that have cluster crystalline phases at low temperatures can model a number of physical systems, such as vortices in type-1.5 superconductors, colloidal suspensions, and cold atoms. In this work, we study a two-dimensional cluster-forming particle system interacting via an ultrasoft potential. We present a simple mean-field characterization of the cluster-crystal ground state, corroborating with Monte Carlo simulations for a wide range of densities. The efficiency of several Monte Carlo algorithms is compared, and the challenges of thermal equilibrium sampling are identified. We demonstrate that the liquid to cluster-crystal phase transition is of first order and occurs in a single step, and the liquid phase is a cluster liquid.
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