About dispersion relation
Is there any way in KWANT that I can plot a 3d graph of dispersion relation?In the tutorial it is given that the infinite system is quasi 1d system.that means is it only giving values for Kx momentum.I guess not. I guess it is the values of energies for momentum K = sqrt(Kx*Kx + Ky*Ky) and K = +sqrt(Kx*Kx + Ky*Ky).Please explain.
Hi Anant, You wrote:
Is there any way in KWANT that I can plot a 3d graph of dispersion relation? In the tutorial it is given that the infinite system is quasi 1d system.
Indeed, in Kwant 1.x lowlevel systems (e.g. finalized builders) can only be either finite or quasi1d. This is because we added the concept of symmetries to Kwant only after the basic lowlevel design was already fixed. We plan to remove this restriction in the next major version of Kwant. For now, you can use a variant of the trick mentioned in http://article.gmane.org/gmane.comp.science.kwant.user/39. As an example, I attach a script that calculates and plots the band structure of graphene. The 6 kpoints are clearly visible. With Kwant 2, an equivalent script will be less “hacky”.
that means is it only giving values for Kx momentum.I guess not. I guess it is the values of energies for momentum K = sqrt(Kx*Kx + Ky*Ky) and K = +sqrt(Kx*Kx + Ky*Ky).
I’m not sure what you mean by this. Best Christoph
Dear all, Due to a bug in my email program, the attached script had some errors (from was capitalized). I send the script again, this time without signing the email message. This should avoid the problem. Best Christoph
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ANANT

Christoph Groth