Size-dispersity effects in two-dimensional melting

Hiroshi Watanabe, Satoshi Yukawa, and Nobuyasu Ito
Phys. Rev. E 71, 016702 – Published 11 January 2005

Abstract

In order to investigate the effect of size dispersity on two-dimensional melting transitions, hard-disk systems with equimolar bidispersity are studied by means of particle dynamics simulations. From the nonequilibrium relaxation behaviors of bond-orientational order parameters, we find that (i) there is a critical dispersity at which the melting transition of the hexagonal solid vanishes and (ii) the quadratic structure is metastable in a certain region of the dispersity-density parameter space. These results suggest that the dispersity not only destroys order but produces new structures under certain specific conditions.

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  • Received 20 July 2004

DOI:https://doi.org/10.1103/PhysRevE.71.016702

©2005 American Physical Society

Authors & Affiliations

Hiroshi Watanabe*, Satoshi Yukawa, and Nobuyasu Ito

  • Department of Applied Physics, School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

  • *Present address: Department of Complex Systems Science, Graduate School of Information Science, Nagoya University, Furouchou, Chikusaku, Nagoya 464-8601, Japan.

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Vol. 71, Iss. 1 — January 2005

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