Cyclotron resonance of trilayer graphene

The cyclotron resonance energies, the corresponding oscillator strengths, and the cyclotron absorption spectrum for trilayer graphene are calculated for both ABA and ABC stacking. A gate potential across the stacked layers leads to $(1)$ a reduction of the transition energies, $(2)$ a lifting of the degeneracy of the zero Landau level, and $(3)$ the removal of the electron-hole symmetry.