Hello,
I need to create my own Hamiltonian. I have a term of nearest-neighbor interaction, and I write in the model file
</BONDTERM>
<BONDTERM source="i" target="j">
-t*bdag(i)*b(j)
</BONDTERM>
Here in the field of the target should I write target="i+1" or should I write simply target="j". What is the difference between the two cases ? In the second case, the source i will go through all the sites and the target j will go through alll the sites too,  I have then interaction of next-nearest-neighbor terms and so on ?
Thank you for your reply.
Best wishes
Tianyou