I am considering the Heisenberg XXZ model at the moment. In the literature it says that (in the $J\Delta\rightarrow\infty$ limit, i.e. the ferromagnetic Ising regime) one can either view low-energy excitations as magnons (single overturned spins), or as domains of consecutive flipped spins, named spinons. The latter is supposed to have spin $S=1$. My question is two-fold:
-How do we easily note the statistics of the introduced particle and what spin it has?
-When do we choose what quasi-particle?