Dear zhang,
Now, I want to plot the transmission coefficient, but I don't know how
to do, could you do me a favor?
Thank you in advance!
2010/9/16 Guangping Zhang <[email protected]>
> 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
>
> <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
>>
>
>
--
Zhendong Guo
Institute of Microelectronics and Optoelectronics, Room 516,
Dept. of Information Science & Electronic Engineering
Zhejiang University
Hangzhou, China, 310027
Phone: 15168215062
Email: [email protected]
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