Great answer! Thanks Huaiming!  Best,Tao Ying -------- 原始邮件 -------- 发件人： hmguo <hmguo@buaa.edu.cn> 日期: 2015-10-24 01:55 (GMT+01:00) 收件人： comp-phys-alps-users <comp-phys-alps-users@lists.phys.ethz.ch> 主题： Re: [ALPS-users] QMC of Bose-Hubbard model with NNN interaction 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