“…Common approaches for calculating the parameters η p and γ L/Rp± include the Matsubara, 68,76,88 the Pade, 89,90 or the Chebyshev decomposition [91][92][93] as well as more intricate schemes. [94][95][96] The δ-function in Eq. ( 9) is directly associated with the wide-band approximation employed in this work.…”