hello,Tao, I think you should define the nnn bonds in the lattice.xml and use different type. Then in bond term, you use type to distinguish then,I.e., bondterm type="1", the other remains the same.

huaiming

在 2015-10-24 03:21:51，"Tao Ying" taoying86@gmail.com 写道：

Dear all,

I want to use QMC in ALPS to simulate Bose-Hubbard model with NNN interaction, we know for NN interaction V, we can define V as following:

<BONDTERM source="i" target="j"> <PARAMETER name="V" default="0"/> V*n(i)*n(j) </BONDTERM>

Now I want to include NNN interaction, how can I define it? (source="i" target="?")

Best regards, Tao Ying

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Tao Ying, Lecturer in department of physics, Harbin Institute of Technology