The current density for a process the electron-positron pair-production
as a function of time out of
vacuum is animated. At time=0 a supercritical potential is switched
on instantaneously with V(x)=0.5 V0 (1+tanh(x/W)) with V0=2c^2+10^4
and W=0.3/c. The electron and positron are shown here to grow in
production at the center of the potential gradient. The electron and
positron densities are found to maintain their shapes throughout the
initial stage until they are drifted away due to the force generated
by the potential step. Atomic units are adopted in this simulation.
[P.Krekora, Q. Su and R. Grobe, Phys. Rev. Lett., in press.]
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