Multi-component response in multilayer graphene revealed through terahertz and infrared magneto-spectroscopy

In this work we present mid-infrared (114 meV–224 meV) polarization-sensitive measurements on multilayer epitaxial graphene, which reveal graphene's rich and complex cyclotron resonant (CR) structure. By using Fourier transform Kerr spectroscopy we are able to separate and identify cyclotron resonances from graphene multilayers with various stacking orders and thicknesses. Moreover, from the identification of the layers present and their measured fundamental band parameters we are able to use these results to better understand previously unexplained CR features in far-infrared (0.1 meV – 87 meV) transmission measurements performed on the same sample.