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

I. V. Schweigert, V. A. Schweigert, F. M. Peeters

cond-mat.mes-hallarXiv:cond-mat/9912057

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.

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