Radial fluctuations induced stabilization of the ordered state in two dimensional classical clusters

TL;DR

This study investigates how radial fluctuations influence the stability of ordered states in 2D classical particle clusters, revealing re-entrant orientational order behavior under certain confinement and interaction conditions.

Contribution

It introduces a detailed simulation analysis showing the role of radial fluctuations in stabilizing ordered states in 2D clusters with specific confinement and interaction types.

Findings

Re-entrant orientational order observed in hard-wall confined clusters.

Radial fluctuations contribute to stabilization of ordered states.

Behavior depends on interaction strength and confinement type.

Abstract

Melting of two dimensional (2D) clusters of classical particles is studied using Brownian dynamics and Langevin molecular dynamics simulations. The particles are confined by a circular hard wall or a parabolic external potential and interact through a dipole or a screened Coulomb potential. We found that with decreasing strength of the inter--particle interaction clusters with short-range inter-particle interaction which are confined by a hard wall exhibit a re-entrant behavior in its orientational order.