  Time-dependent nonequilibrium properties of a strongly correlated electron
system driven by large electric fields is obtained by means of solving the
time-dependent Schr\"odinger equation for the many-body wave function
numerically in one dimension. While the insulator-to-metal transition depends
on the electric field and the interaction, the metallization is found to be
described in terms of a universal Landau-Zener quantum tunneling among the
many-body levels. These processes induces current oscillation for small
systems, while give rise to finite resistivity through dissipation for larger
systems/on longer time scales.
