  The search of new topological insulators that demonstrate the quantum
anomalous Hall effect (QAHE) is a cutting-edge research topic in condensed
matter physics and materials science. So far, the QAHE has been observed only
in Cr-doped (Bi,Sb)2Te3 at extremely low temperature. Therefore, it is
important to find new materials with large topological band gap and high
thermal stability for the realization of the QAHE. Based on first-principles
and tight-binding model calculations, we discovered a new class of topological
phase$-$Chern half metal which manifests the QAHE in one spin channel while is
metallic in the other spin channel$-$in Co or Rh deposited graphene. Meanwhile,
these systems have large perpendicular magnetic anisotropy energies of 5.3 and
11.5 meV, necessary for the observation of the QAHE at reasonably high
temperature.
