Doping dependences of NQP properties. The real and imaginary parts of mass enhancement spectra were directly deduced from the APRES data shown in Figure 4. (a) Inverse group velocity, 1/vg(ω) = [1 + Re λ(ω)]/v0, determined from (d/dω) k(ω). (b) Differential scattering rate -Im λ(ω)/v0, deduced from the Kramers-Kronig transform (KKT) of (a). (c) Partial coupling constants, λLE (red circles) and λIE (blue triangles), deduced from (b). Also shown are the inverse group velocities at ω = 0 (black circles) and at ω = -40 meV (black triangles). (d) Differential scattering rate -Im λ(ω)/v0, directly determined from -(d/dω) Δk(ω). (e) Partial coupling constants, λLE (red circles), λIE (blue triangles), and λHE (green diamonds), deduced from (d).
Ino et al. Nanoscale Research Letters 2013 8:515 doi:10.1186/1556-276X-8-515