Dear Hari, The Green's function in kwant is calculated between the sites that are attached to leads. If you want to evaluate it for a specific site (or list of sites), just attach a fictitious lead with zero self energy. You can find different examples in the kwant arxiv. At the last step, you need to mathematically express your observable using the needed Green's function elements.
Check this for example: https://www.mail-archive.com/kwant-discuss@python.org/msg00048.html I hope this helps, Adel On Mon, Nov 21, 2022 at 10:35 PM Hari Gautam <gautamhari1...@gmail.com> wrote: > Dear kwant users, > I find the wavefunction methods with sufficient example for calculation of > local observables using operators in kwant. I would also like to calculate > the local observables using Green functions. > > As far as I know, I understood that the green_function method only > provides the surface Green function at the interface of the lead and the > scattering system which is helpful to calculate the total conductance. How > can we define local observables using Green functions in kwant? Is there > any methods like operators included in the kwant? > > Thank you > Hari > -- Abbout Adel
