Does the structure of Pop III supernova ejecta affect the elemental
  abundance of extremely metal-poor stars?
  The first generation of metal-free (Pop III) stars are crucial for the
production of heavy elements in the earliest phase of structure formation.
Their mass scale can be derived from the elemental abundance pattern of
extremely metal-poor (EMP) stars, which are assumed to inherit the abundances
of uniformly mixed supernova (SN) ejecta. If the expanding ejecta maintains its
initial stratified structure, the elemental abundance pattern of EMP stars
might be different from that from uniform ejecta. In this work we perform
numerical simulations of the metal enrichment from stratified ejecta for normal
core-collapse SNe (CCSNe) with a progenitor mass $25 \ {\rm M}_{\bigodot}$ and
explosion energies 0.7--10 B ($1 \ {\rm B} = 10^{51}$ erg). We find that SN
shells fall back into the central minihalo in all models. In the recollapsing
clouds, the abundance ratio ${\rm [M/Fe]}$ for stratified ejecta is different
from the one for uniform ejecta only within $\pm 0.4$ dex for any element M. We
also find that, for the largest explosion energy (10 B), a neighboring halo is
also enriched. Only the outer layers containing Ca or lighter elements reach
the halo, where ${\rm [C/Fe]} = 1.49$. This means that C-enhanced metal-poor
(CEMP) stars can form from the CCSN even with an average abundance ratio ${\rm
[C/Fe]} = -0.65$.
