We studied the microscopic kinetics of the amorphous-liquid interface in su
percooled laser-melt silicon by means of molecular dynamics computer simula
tions. The interface velocity was obtained as a function of temperature by
direct simulation of the interface motion in an amorphous-liquid model syst
em. The temperature dependence of the kinetic prefactor was extracted from
the interface velocity function and compared to the values of self-diffusiv
ity obtained from independent molecular dynamics simulations of bulk amorph
ous Si. The kinetic prefactor for interfacial diffusion shows a distinctly
non-Arrhenius behavior which is attributed to Fulcher-Vogel kinetics in the
supercooled liquid. (C) 2000 American Institute of Physics. [S0003- 6951(0
0)04641-6].