Anonymous @ on
In the time-dependent NEGF equation, given a sigma_in(t,t’) due to the dot, I am getting an I-V equation that is making it difficult for me to group terms. For instance, looking at the analogue of the first term of I = 2q/hbar. int dE TrGin I get I1 = q/ihbar. int dt1 TrSigma_in.G^dagger-G.Sigma_in
Now, because of the different order of the time arguments in the G and G^dagger terms, I cannot pool these to write it as a spectral function A = i(G-G^dagger). Similarly, I can’t seem to take Sigma – Sigma^dagger to get Gamma. Is this correct?