Single-photon absorption of light and linear circular dichroism in gallium phosphide electronic conductivity

is medium light refractive index at the frequency , is exit time from the resonance region of carriers in the branch l, b-parameter zone, which is a factor to be linear in term in the wave vector of the effective Hamiltonian, , T-temperature, is Boltzmann constant, b=P and in the case of n-GaP; and in tellurium