text: 0.4 
  ) 
  c 
  ω 
  ( 
  
  S 
  N 
  W 
  − 
  ) 
  0 
  c 
  ω 
  ( 
  
  C 
  S 
  W 
  
  −0.4 
  0.2  0.4 
  0.6 
   in eV 
  0.8 
  ω 
  c 
  
  FIG. 14: The special case of α = 1.5,Γ = 5 meV , other pa- 
  rameters the same as in Fig. 10. These parameters are chosen 
  to illustrate that two sign changes (indicated by arrows in the 
  ﬁgure) are also possible within the original MFLI model. 