Hi Zhang, I'm not an expert in Transiesta but as a physicist I can give you some tips.
Some works in transmission coefficients using the Transport Matrix method shows that in systems similar to quantum barriers is possible to occur coefficients greater than one. I talked to one Cuban researcher in one meeting in 2008 which works with this research line. His name is Leo-Diago Cisneiros, of Havana University. You might search for his works and understood the results of this features. I'm not saying that there is no error in the Transiesta calculations, but there is other results that shows that is possible to obtain T > 1. Yours, Weslley. -- Weslley Souza Patrocinio Researcher Nanotechnology group Wernher von Braun Center for Advanced Research e-mail: wesl...@vonbraunlabs.com.br skype: weslley.vonbraun
