QuantumATK Forum

QuantumATK => General Questions and Answers => Topic started by: kaypu on March 11, 2011, 15:52

Title: a question about transmission spectrum
Post by: kaypu on March 11, 2011, 15:52
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?

Title: Re: a question about transmission spectrum
Post by: zh on March 12, 2011, 10:43
Quote

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.
Title: Re: a question about transmission spectrum
Post by: kaypu on March 12, 2011, 15:05
thank you zh
how to evaluated  from the number of bands crossing the Fermi level? can you give me some references? thank you