Dresden 2003 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.98: Poster

Donnerstag, 27. März 2003, 15:30–18:00, P1

Computer Simulation Results on the Melting Process of Two-Dimensional Classical Clusters in Confined Geometry — •Peter Henseler and Peter Nielaba — Lehrstuhl für Theoretische Physik, Fachbereich Physik, Universität Konstanz, D-78457 Konstanz

The melting behavior of two-dimensional clusters of classical particles is studied using Monte Carlo simulations [1]. The particles are confined either by a circular hard wall or by a parabolic external potential and interact through a dipole or a screened Coulomb potential. The simulation results are compared with the experimental results in [2, 3] and with former theoretical studies using Brownian dynamics and Langevin molecular dynamics simulations [4, 5, 6].

The angular diffusion of the particles, which are arranged in shells, is highly anisotropic and shows an interesting behavior with decreasing strength of the interparticle interaction. Based on the results of classical Monte Carlo simulations we discuss the possible importance of radial particle fluctuations (and shell jumps) for the experimentally observed reentrant behavior.

[1] P. Henseler, diploma thesis, Universität Konstanz (2002)

[2] R. Bubeck et al., Phys. Rev. Lett. 82, 3364 (1999)

[3] R. Bubeck et al., Europhys. Lett. 60, 474 (2002)

[4] I. V. Schweigert et al., Phys. Rev. Lett. 84, 4381 (2000)

[5] B. Rinn et al., Phys. Rev. Lett. 86, 4711 (2001)

[6] I. V. Schweigert et al., Phys. Rev. Lett. 86, 4712 (2001)