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The electron-phonon coefficients g
are defined as
The phonon linewidth 
 is defined by
 is defined by
|  = 2      | g   (  , i, j)|2  (e  , i - eF)  (e  +  , j - eF), | (2) | 
 
while the electron-phonon coupling constant 
 for
mode
 for
mode  at wavevector
 at wavevector  is defined as
 is defined as
|  =   | (3) | 
 
where N(eF)
 is the DOS at the Fermi level.
The spectral function is defined as
The electron-phonon mass enhancement parameter  can also be defined as the first reciprocal momentum of 
the spectral function:
can also be defined as the first reciprocal momentum of 
the spectral function:
Note that a factor M-1/2
 is hidden in the definition of
normal modes as used in the code.
McMillan:
or (better?)
where
 
 
 
 
 
 
 
  
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Layla Martin-Samos Colomer
2012-11-21