text: 0 
  0.4 
  λ (the coupling constant) 
  0.2  0.6 
  
  FIG. 6: Evolution of ∆W in the presence of a lattice (solid 
  line) compared with the case of no lattice(a constant DOS, 
  dashed line) for clean and dirty limits. ∆ = 30 meV , Γ = 
  3.5 meV (clean limit), Γ = 150 meV (dirty limit) 
  FIG. 7: Top- conductivities in the NS and the SCS for the EB 
  model. The conductivity in the NS vanishes below ω0 because 
  of no phase space for scattering. Bottom - Kubo sums as a 
  function of coupling. Observe that WK in the SCS is below 
  that in the NS. We set ωo = 40 meV , ∆ = 30 meV , λ = .5 
  
  1 
  o − ω′ 
  ω + ω′ 
  (ω + ω′)2 − ∆2 
  dω′ 
  ω2  2 − iδ 
  
  1 
  p 
  ) 
  
  ∞ 
  W 
  ( 
  
  0.6 
  / 
  ) 
  c 
  
  ω 
  W 
  ( 
  
  0.2 