We theoretically show how constant-energy maps of the angle-resolved photoemission intensity can be used to test wave function symmetry in graphene. For monolayer graphene, we demonstrate that the observed anisotropy of angle-resolved photoelectron spectroscopy spectra is a manifestation of what has been recently branded as an electronic chirality. For bilayer graphene, we show that the anisotropy of the constant-energy maps may be used to extract information about the magnitude and sign of interlayer coupling parameters and about symmetry breaking inflicted on a bilayer by the underlying substrate.
Mucha-Kruczynski, M., Tsyplyatyev, O., Grishin, A., McCann, E., Fal'ko, V. I., Bostwick, A., & Rotenberg, E. (2008). Characterization of graphene through anisotropy of constant-energy maps in angle-resolved photoemission. Physical Review B, 77(19), . https://doi.org/10.1103/PhysRevB.77.195403