Boson structures in the relation between optical conductivity and quasiparticle dynamics

摘要: An extended Drude form is often used to analyze optical data in terms of an scattering rate and renormalized mass corresponding, respectively, the real imaginary part memory function. We study relationship between function quasiparticle self-energy for isotropic system. particularly emphasize boson signatures. find it useful introduce a new auxiliary model its Kramers-Kronig transform determined solely from optics which are much closer than itself normal state. In superconducting state simplification fails because density states acquires essential energy dependence.