The s=-1 XXX chain, equivalent to the lattice nonlinear Schrodinger model, has a thermodynamic description whose elementary excitations are fermion-like lipatons with a c=1 conformal field theory at low energy.
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Bethe Ansatz for XXX chain with negative spin
The s=-1 XXX chain, equivalent to the lattice nonlinear Schrodinger model, has a thermodynamic description whose elementary excitations are fermion-like lipatons with a c=1 conformal field theory at low energy.