Dr. Julian Schneider,

For any particular energy 'E', one way to find the Transmission co-eff. is......

T(E) = Summation of [t

_{k} t

_{k}^{dagger} delta(E-Ek)] for all 'k' states at energy 'E'

Which is again same as..... Trace[Gr Sigma1 Sigma2 Ga] ....

On the other hand, we have transmission eigen values of the transmission matrix...which can also be summed up...

for getting the transmission co-efficient...

1) How can one get these t

_{k }s (or, as you say transmission amplitudes).....??

Actually, why I'm looking for this...is simply to find an analogy...with the ideal transmisson....either 0 or, 1.

2) Is it incorporated through the delta function....??