Volume 86, Number 6, June 2009
Article Number 66004
Number of page(s) 6
Section Condensed Matter: Structural, Mechanical and Thermal Properties
Published online 09 July 2009
EPL, 86 (2009) 66004
DOI: 10.1209/0295-5075/86/66004

Structural and dynamical heterogeneities in two-dimensional melting

H. Shiba, A. Onuki and T. Araki

Department of Physics, Kyoto University - Kyoto 606-8502, Japan

received 1 April 2009; accepted in final form 2 June 2009; published June 2009
published online 9 July 2009

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 sixfold 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 $\Gamma _{k}\propto k^{z}$ with z ~ 2.6 at small k in the hexatic phase.

64.70.D- - Solid-liquid transitions.
61.72.J- - Point defects and defect clusters.
83.10.Rs - Computer simulation of molecular and particle dynamics.

© EPLA 2009