A microscopic model for detecting the surface states photoelectrons in Topological Insulators

We present a model for the photoelectrons emitted from the surface of a Topological insulator induced by a polarized laser source. The model is based on the tunneling of the surface electrons into the vacuum in the presence of a photon field. Using the Hamiltonian which describes the coupling of the photons to the surface electrons we compute the intensity and polarization of the photoelectrons.