Hi Nafise

I need to make a periodic lattice with hole. In fact I should make holes on the scattering region and also on the leads. Although I can make this kind of lattice by kwant, I have problem about the distances between holes. I want to make a periodic holes on the nanoribbon but the distance between holes in the scattering region is different from the distance between holes in the other regions. Would you please let me know How Can I make a same distance between holes? Should I work on the translational symmetry in the leads?

Because the leads need to be translationally invariant if you want a very large distance between defects then your unit cell in the leads needs to be correspondingly large. If you post a code example of what your problem is specifically we may be able to help more. Happy Kwanting, Joe P.S. sorry for the double reply; I forgot to send to the mailing list also