[ALPS-users] Conserve quantum number for composite unit cell

[Axel Gagge]

?Hello, I just wanted to ask if it is possible to preserve a combination of quantum numbers such as the total number of excitations:


N = \sum_{bosonic sites} n_j + 1/2 \sum_{spinful sites} s_z


and what the syntax for this would be? I guess that one option would be to define a new quantum number and let Splus raise it by 1/2 but I just thought that I would check this with you first!


Otherwise, thank you for an excellent library! I have had no problems so far with the new release.


Thanks,

/Axel Gagge

First year PhD Student, Stockholm University
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