Frequency dependence of the Drude relaxation time in metal films

Frequency‐Dependent Relaxation Time of Electrons in PbSe from Infrared Measurements

“…The dependence of z on (0 in our results cannot be interpreted also by the cor rections to Wallace's (or Drude's) theory given by the inhoniogeneity of the sani ple (different z in different parts of the sample). The effective relaxation time changes then with frequency only in the region (0 x z -l [ 7 ] while in our experiment (1) >rl. For normal incidence of radiation on a smooth surface, one cannot expect also the free-carrier absorption consisting in surface-plasmon generation [19, 201. One may try to explain the bump on the T -~ versus u) dependence by multiphonon electron scattering, e.g.…”

Extended Drude model analysis of noble metals

“…(1), similar expression for 1 τ / can be obtained in terms of the dielectric constant ( ) ε ω [18] where ε • should appear explicitly in the formalism. ε • , however, can be considered separately if the Drude parameters are formulated by the optical conductivity instead of the dielectric constants.…”

Optical properties of metallic films

“…Several explanations have been given for the quadratic term. Nagel and Schnatterly [28] describe dynamic conductivity using a two-carrier model in which the constant term is the DC relaxation time of carriers inside the crystalline grains, and the quadratic term is determined by a second distinct carrier type on the grain boundaries. A second explanation in Parkins et al [29] is that the quadratic term results from electron-electron scattering events that occur in all metals at high frequency and are independent of temperature and crystal defects.…”