The Coulomb excitation behaviors are mainly determined by the electronic structures and geometric symmetries. The 2pz orbitals of carbon atoms in graphene-related systems, which built the π valence bands and the πast conduction bands, are responsible for the electronic excitations lower than the middle frequency (~6-10 eV). The low-lying band structures of layered graphenes strongly depend on the intralayer and interlayer hopping integrals of 2pz orbitals. The trilayer ABA stacking (Figure 5.1a) exhibits the unusual energy bands, two pairs of parabolic valence and conduction bands and one pair of distorted Dirac-cone structures (Figure 5.1b); the corresponding van Hove singularities are presented in the density of states (DOS) (Figure 5.1c). As verified from the high-resolution angle-resolved photo emission spectroscopy [64,284,285], the distorted Dirac cone could survive in AB-stacked graphene systems with odd layers [64,284]. Also, there exist the special wave functions arising from the specific superpositions of the six tight-binding functions, being directly reflected in the existence/strength of the Coulomb interactions. Band structure and wave functions are directly included in the current calculations.