Structural and dynamical heterogeneities in two-dimensional melting

Details Structural and dynamical heterogeneities in two-dimensional melting Structural and dynamical heterogeneities in two-dimensional melting

2008-08-11

arxiv.org/abs/0808.1453v4

EPL 86, 66004 (2009)

Physics

Condensed Matter

Statistical Mechanics

6 pages, 8 figures

Scientific paper

10.1209/0295-5075/86/66004

Using molecular dynamics simulation, we study structural and dynamical heterogeneities at melting in two-dimensional one-component systems with 36000 particles. Between crystal and liquid we find intermediate hexatic states, where the density fluctuations are enhanced at small wave number k as well as those of the six-fold orientational order parameter. Their structure factors both grow up to the smallest wave number equal to the inverse system length. The intermediate scattering function of the density S(k,t) is found to relax exponentially with decay rate Gamma_k ~ k^z with z~2.6 at small k in the hexatic phase.

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