Hello Kamal, Dear Joseph Weston, > Very many thanks for your instruction to run my code successfully. But, it > did not work, instead > it sent message "run time error" after showing the system plot. Yes, I > simply changed to > kwant.plotter.bands(sys.leads[0],show=False). >
When I run it I get no errors. It is a question to me how the "sys" in my code was finite? You also agree > that the system "sys" is > attached with leads and thereby it turns into infinite system. When I use terms enclosed in backticks, like `FiniteSystem` and `InfiniteSystem` I am referring to the types defined in `kwant`. I you look at the documentation you will see that an `InfiniteSystem` is a system that has a spatial symmetry (and is invariant by translation). A `FiniteSystem` consists of a (finite) scattering region with no symmetry, *possibly with attached leads*. While it is true that when a `FiniteSystem` has leads attached it actually represents a system that is infinite in extent, this is *still called `FiniteSystem` in Kwant nomenclature*. Is it not possible to draw band diagrams > only in the Quantum Well which is only the central part of the entire > system ( composed of leads + that > central part ). > To be honest again, how then I can find by kwanting the band diagrams of > only the > qwantum well itself?? > What do you mean? Band structure is only defined for a system that is invariant be translation. Your full system of well + leads is not invariant by translation, therefore you cannot calculate a band structure for the full thing. Regards, Joe P.S. In future, please try to keep related emails in the *same email thread*. As it is you have started a new thread, which will make it difficult for people to follow the discussion from the beginning.
