  In order to unveil the 4f electronic structures in cerium monopnictides (CeX,
where X = N, P, As, Sb, and Bi), we employed a state-of-the-art
first-principles many-body approach, namely the density functional theory in
combination with the single-site dynamical mean-field theory, to make detailed
calculations. We find that the 4f electrons in CeN are highly itinerant and
mixed-valence, showing a prominent quasi-particle peak near the Fermi level. On
the contrary, they become well localized and display weak valence fluctuation
in CeBi. It means that a 4f itinerant-localized crossover could emerge upon
changing the X atom from N to Bi. Moreover, according to the low-energy
behaviors of 4f self-energy functions, we could conclude that the 4f electrons
in CeX also demonstrate interesting orbital-selective electronic correlations,
which are similar to the other cerium-based heavy fermion compounds.
