8th Liquid Matter Conference September 6-10, 2011 Wien, Austria ...

Thu 811:10-14:00P8.19Higher order parameters for establishing transientcrystalsMasaharu Isobe 1 and Berni Alder 21 Nagoya Institute of Technology, Gokiso-cho, Showa-ku, 466-8555, Nagoya, Japan2 Lawrence Livermore National Laboratory, Livermore, United States of AmericaThe long slow decaying potential part of the stress autocorrelation function has been called the“molasses tail” to distinguish it from the hydrodynamic origin of the long time tail in the velocityauto-correlation functions and to emphasize its relation to highly viscous glassy state. We areinvestigating the molasses tail in dense hard core fluids by using extensive Event-Driven MDsimulation through the orientational autocorrelation functions[1, 2]. Near the fluid-solid phasetransition, there exist three regimes in the relaxation of the pair orientational autocorrelationfunction, namely the kinetic, molasses(stretched exponential), and diffusional power decay. Themost striking observation through the bond orientatinal order parameter is the dramatic increase ofthe transient nuclei cluster size near the freezing density[2]. We are now improving the alternativemethod to establish the transient nuclei by auto-correlation function of higher order parameters[3].[1] M. Isobe and B. J. Alder, Mol. Phys. 107 609 (2009).[2] M. Isobe and B. J. Alder, Prog. Theor. Phys. Suppl. 184 437 (2010).[3] M. Isobe and B. J. Alder, in preparation.19