Hi, > This means that kwant takes into account also some regions outside the > leads e.g. bulk metal contacts. > > As a result some dependence on E is obtained even for the case of zero > depth of the potential whell and it is not identically one. > > So, is it possible to obtain in Kwant the transmission coefficient through > the defined in the scattering region structures which is not affected by > anything else?
You have created a system with a finite width of N sites, which means that in general there will be a finite number of propagating modes open at a given energy. As there is no backscattering in the system I expect the transmission to be equal to the number of propagating modes open at a given energy, which is indeed what I see when I run your code. You appear to be confused about the definition of transmission. It is not a probability and so is not bound to the interval [0, 1]. You may want to read chapter 3 of the book "Electronic Transport in Mesoscopic Systems" by S. Datta for an introduction to the formalism that Kwant is based on. Happy Kwanting, Joe
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