  Motivated by our previous work using the Stillinger-Weber potential, which
shows that the [$\overline{2}11$] step on 1$\times$1 reconstructed Si(111) has
a Schwoebel barrier of 0.61$\pm$0.07 eV, we calculate here the same barrier
corresponding to two types of kinks on this step - one with rebonding between
upper and lower terrace atoms (type B) and the other without (type A). From the
binding energy of an adatom, without additional relaxation of other atoms, we
find that the Schwoebel barrier must be less than 0.39 eV (0.62 eV) for the
kink of type A (type B). From the true adatom binding energy we determine the
Schwoebel barrier to be 0.15$\pm$0.07eV (0.50$\pm$0.07 eV). The reduction of
the Schwoebel barrier due to the presence of rebonding along the step edge or
kink site is argued to be a robust feature. However, as the true binding energy
plots show discontinuities due to significant movement of atoms at the kink
site, we speculate on the possibility of multi-atom processes having smaller
Schwoebel barriers.
