Dear Henrik, Thanks very much! 2010-09-16
Guangping Zhang 发件人: Henrik Löfås <[email protected]> 发送时间: 2010-09-16 18:03 主 题: Re: Re: [SIESTA-L] How to understand the transmission coefficient bigger than one. 收件人: [email protected] Dear Zhang, This is not strange, since the results from TRANSIESTA are given in units of G_0 (The quantum of conductance). For example in a 1D-system, if you have resonant transport your maximum transmission would be 1 (G_0) since you only have one eigenchannel. For a 3D-system things get more complex and you get more eigenchannels, hence the total transmission can add up to more than one (in units of G_0). So what happen between your calculations is probably that the results get more converged and you open up more eigenchannels, hence get a higer total transmission. For more info about transmission and eigenchannels, see the basic paper for transiesta. http://prb.aps.org/abstract/PRB/v65/i16/e165401 Regards Henrik 2010/9/16 Guangping Zhang <[email protected]> Dear Weslley, Thanks for your help.It is nice of you. 2010-09-16 Guangping Zhang 发件人: Weslley Souza Patrocinio <[email protected]> 发送时间: 2010-09-15 22:07 主 题: Re: [SIESTA-L] How to understand the transmission coefficient bigger than one. 收件人: [email protected] 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: [email protected] skype: weslley.vonbraun
