What you need is to define a third quantum number that increases in one when the boson number increases and decreases in one when the spin index increases. You have to implement it at the level of the local basis.

Best M El 07/05/2016 05:32, "梁霄" lxxhlb@mail.ustc.edu.cn escribió:

Dear all,

  Recently I am using ALPS simulating JCH model. To construct the

basis for atom-light interaction, two types of basis are defined on each site. My question is how to set a constraint of the summation from two types of basis?

For example,

<BASIS> <SITEBASIS type="0" ref="M"/> <SITEBASIS type="1" ref="N"/> <CONSTRAINT quanumnumber="A+B" value="C"/> </BASIS>

A and B are from sitebasis M and N. Does the method above work? Thanks.

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