We predict a new class of topological crystalline insulators (TCI) in the
anti-perovskite material family with the chemical formula A3BX. Here the
nontrivial topology arises from band inversion between two J=3/2 quartets,
which is described by a generalized Dirac equation for a "Dirac octet". Our
work suggests that anti-perovskites are a promising new venue for exploring the
cooperative interplay between band topology, crystal symmetry and electron
correlation.Comment: Accepted as PRB Rapid Communication. 4 pages, 3 figures, 3 pages of
Supplementary Material. Typos fixe