Can random pinning change the melting scenario of two-dimensional core-softened potential system?

Abstract

In experiments the two-dimensional systems are realized mainly on solid substrates which introduce quenched disorder due to some inherent defects. The defects of substrates influence the melting scenario of the systems and have to be taken into account in the interpretation of the experimental results. We present the results of the molecular dynamics simulations of the two dimensional system with the core-softened potential in which a small fraction of the particles is pinned, inducing quenched disorder.The potentials of this type are widely used for the qualitative description of the systems with the water-like anomalies. In our previous publications it was shown that the system demonstrates an anomalous melting scenario: at low densities the system melts through two continuous transition in accordance with the Kosterlitz-Thouless-Halperin-Nelson-Young (KTHNY) theory with the intermediate hexatic phase, while at high densities the conventional first order melting transition takes place. We find that the well-known disorder-induced widening of the hexatic phase occurs at low densities, while at high density part of the phase diagram random pinning transforms the first-order melting into two transitions: the continuous KTHNY-like solid-hexatic transition and first-order hexatic-isotropic liquid transition.

5 pages, 4 figures

References in corpus (15)

• Square ice in graphene nanocapillaries
• 2D Melting: From Liquid-Hexatic Coexistence to Continuous Transitions
• Hard-disk equation of state: First-order liquid-hexatic transition in two dimensions with three simulation methods
• Quasi-binary amorphous phase in a 3D system of particles with repulsive-shoulder interactions
• Two-dimensional melting under quenched disorder
• Two-stage melting induced by dislocations and grain boundaries in Monolayers of Hard Spheres
• Anomalies in a waterlike model confined between plates
• Superfragile glassy dynamics of onecomponent system with isotropic potential: competition of diffusion and frustration
• Hexatic phase and water-like anomalies in a two-dimensional fluid of particles with a weakly softened core
• Effect of a potential softness on the solid-liquid transition in a two-dimensional core-softened potential system
• Silica-Like Sequence of Anomalies in Core-Softened Systems
• A water-like model under confinement for hydrophobic and hydrophilic particle-plate interaction potentials
• Structural behavior and dynamics of an anomalous fluid between solvophilic and solvophobic walls: templating, molding and superdiffusion
• Coexistence of hexatic and isotropic phases in two-dimensional Yukawa systems
• Phase diagram of the system with the repulsive shoulder potential in two dimensions: density functional approach

Cited by in corpus (7)

• Phase diagram and melting scenarios of two-dimensional Hertzian spheres
• Random pinning elucidates the nature of melting transition in two-dimensional core-softened potential system
• The role of attraction in the phase diagrams and melting scenarios of generalized 2D Lennard-Jones systems
• The influence of random pinning on the melting scenario of two-dimensional soft-disk systems
• Dewetting and Spreading Transitions for Active Matter on Random Pinning Substrates
• A new mechanism of structural transition in 2D Hertzian spheres in the presence of random pinning
• Stripe phase of two-dimensional core-softened systems: structure recognition