Fig. 4.

Change in interface position during crystallization and melting. $△$, crystal growth when the voltage is stepped from 0 to 80 V; $▽$, crystal melting when the voltage is stepped from 80 to 0 V. (A) BCC–liquid interface ($v_{growth}$ = 0.0087 $\pm$ 0.0006 $\mathrm{\mu }$m/s, $v_{melting}$ = −0.0118 $\pm$ 0.0013 $\mathrm{\mu }$m/s). (B) FCC–liquid interface ($v_{growth}$ = 0.0084 $\pm$ 0.0004 $\mathrm{\mu }$m/s, $v_{melting}$ = −0.0099 $\pm$ 0.0005 $\mathrm{\mu }$m/s).