Magneto-optical spectra of ABA trilayer graphene: interplay between monolayer and bilayer signatures*

We utilize a generalized tight-binding model to study the Landau level spectra of ABA trilayer graphene. The spatially resolved Landau wave functions enable the characterization of Landau levels and the calculation of magneto-optical properties. The spectra consist of monolayer-like and bilayer-like features, in which the inter-valley symmetry is lifted, especially the levels close to zero energy. Applying a bias voltage effectively increases the splitting, and furthermore, triggers the optical transitions between monolayer-like and bilayer-like Landau states. The calculated results can be further verified by optical measurements, and this numerical method can be applied to other layered materials, such as Molybdenum disulfide.