Hi Bill,
> Dear Joe > "add_site_family" did work in graphene zigzag nanoribbon.When I > use "add_site_family",the central scattering region would not enlarge > after connected with leads in zigzag nanoribbon.But when I use it in > graphene armchair nanoribbon,the central scattering region will > enlarge. If you have spare time,you can run my code,and you can see > the picture that the central scattering is enlarge a little in up and > downd leads,left and right lead is right. > Thank you > Bill Yang > Ah, I understand now. In your original email you talked about a "triangle of sites", which I did not see in the images you posted, so I was unsure what you were talking about. I don't think you be able to get rid of the "extra added bit" with a judicious choice of 'other_vectors'; I think you'll have to define the lattice differently in order to do what you want. On the other hand, is this extra added region such a problem? There will be no physical consequences, as the extra added piece has the same Hamiltonian as the leads... Happy Kwanting, Joe
