Optical and magneto-optical properties of simple cubic phase of the C60 crystal

We present without coulomb excitonic interaction effect, SU-Schrieffer-Heeger model, and with including this effect, Hartree-Fock and single configuration interaction model, in conjunction with the local field method, numerical calculations of dielectric tensor, refractive index, circular dichroism, birefringence coefficient and the effects of spatial dispersion on the spectrum of the transverse normal polariton waves of the simple cubic phase of the C60 crystal. Our calculated optical dielectric constant, allowed excitonic absorption spectra, and circular dichroism is in good agreement with other experimental and theoretical results. Our results on the effect of spatial dispersion, compared with no dispersive case, indicates that the first branch of transverse normal polariton in C60 crystal is due to the coupling of the second excitonic state of C60 molecule with the electromagnetic field and the first excitonic state has almost weak coupling