a question about transmission spectrum

[kaypu]

Dear everyone:
              i have a question about transmission spectrum. In my opinion, a transmission channel has a maximum quantum conductance G0, Consider a channel with two spin-degenerate levels, the maximum quantum conductance is 2G0,

in my two probe system, i calculate the transmission spectrum from -2eV to 2eV,

the question is :

the transmission coefficient from -1.5eV to 1eV is larger than 2, is it right?

[zh]

the transmission coefficient from -1eV to 1eV is larger than 2, is it right?

The value of transmission coefficient is not determined by the calculated energy range. For a ballistic transport, the quantum conductance can be evaluated roughly from the number of bands crossing the Fermi level.

[kaypu]

thank you zh
how to evaluated  from the number of bands crossing the Fermi level? can you give me some references? thank you