Dispersity-Driven Melting Transition in Two Dimensional Solids

Details Dispersity-Driven Melting Transition in Two Dimensional Solids Dispersity-Driven Melting Transition in Two Dimensional Solids

1997-05-21

arxiv.org/abs/cond-mat/9705218v1

Physics

Condensed Matter

Materials Science

In revtex format, 4 pages, 6 postscript figures. Submitted to PRL

Scientific paper

10.1103/PhysRevLett.79.3206

We perform extensive simulations of $10^4$ Lennard-Jones particles to study the effect of particle size dispersity on the thermodynamic stability of two-dimensional solids. We find a novel phase diagram in the dispersity-density parameter space. We observe that for large values of the density there is a threshold value of the size dispersity above which the solid melts to a liquid along a line of first order phase transitions. For smaller values of density, our results are consistent with the presence of an intermediate hexatic phase. Further, these findings support the possibility of a multicritical point in the dispersity-density parameter space.

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