  We demonstrate, using well-established nonequilibrium growth models, that
mound formation in the dynamical surface growth morphology does not necessarily
imply a surface edge diffusion bias (the Schwoebel barrier) as has been almost
universally accepted in the literature. We find mounded morphologies in several
nonequilibrium growth models which incorporate no Schwoebel barrier. Our work
should lead to a critical re-evaluation of recent experimental observations of
mounded morphologies which have been theoretically interpreted in terms of
Schwoebel barrier effects.
