Session W24: Glassy and Amorphous Systems

2:30 PM–5:18 PM, Thursday, March 13, 2008
Morial Convention Center - 216

Sponsoring Unit: DCMP
Chair: Bruno Uchoa, Boston University

Abstract: W24.00003 : Out-of-Equilibrium to In-Equilibrium Dynamics of SiO$_2$

2:54 PM–3:06 PM

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Authors:

  Katharina Vollmayr-Lee
    (Bucknell University)

  Jake Roman
    (Bucknell University)

  Juergen Horbach
    (DLR, Koeln, Germany)

We study the aging dynamics of SiO$_2$ (modeled by the BKS model) via molecular dynamics simulations. The system is well equilibrated at temperature $T_{\rm high}$, then quenched to $T_{\rm low}$ and observed after a waiting time $t_{\rm wait}$. We present results for the structure factor, for the mean squared displacement, and for the intermediate scattering function. The resulting relaxation times show for the largest investigated $T_{\rm low}$ that during the simulation run the system is first out-of equilibrium and then reaches equilibrium with relaxation times independent of $T_{\rm high}$ and $t_{\rm wait}$.