QuantumATK Forum

QuantumATK => General Questions and Answers => Topic started by: ph on May 27, 2013, 15:14

Title: How to plot normalized Transmission vs Energy[eV] graph
Post by: ph on May 27, 2013, 15:14

Dear Sir,
Is there any option in VNL to plot normalized transmission spectrums?. If not what additional python script do we add to achieve the same?

Regards
 

Title: Re: How to plot normalized Transmission vs Energy[eV] graph
Post by: Anders Blom on May 27, 2013, 16:52

Define "normalized", please.

Title: Re: How to plot normalized Transmission vs Energy[eV] graph
Post by: ph on May 28, 2013, 08:07

The maximum magnitude of the plot should be unity. Kindly see model graphs attached.

Title: Re: How to plot normalized Transmission vs Energy[eV] graph
Post by: Anders Blom on May 28, 2013, 08:54

The graphs you show are - most likely - for a simple model calculation with a single channel (it looks like just a square barrier transmission).

The transmission values reported in ATK are already normalized, in the sense that they are presented in units of the conductance quantum. The fact that T(E) may be larger than 1 is not a problem of normalization, it's a reflection of the fact that there may be more than one channel present at a particular energy. Thus normalizing it to unity would be quite misleading, and in fact wrong.