Stacking dependence of carrier interactions in multilayer graphene systems

We identify qualitative trends in the stacking sequence dependence of carrier-carrier interaction phenomena in multilayer graphene. Our theory is based on an approach which explicitly exhibits the important role in interaction phenomena of the momentum-direction-dependent intersite phases determined by the stacking sequence. Using this method, we calculate and compare the self-energies, density-density response functions, collective modes, and ground-state energies of several different few-layer graphene systems. The influence of electron-electron interactions on important electronic properties can be understood in terms of competition between intraband exchange, interband exchange, and correlation contributions that vary systematically with the stacking arrangement.