infinite U in Fermi Hubbard model

[Faridun]

Thank you for your reply.
One more question. Is it possible to add Neel spin pattern symmetry to tJ model?
There was similar question about this symmetry:

additional symmetry in the tj model

Dear Itensorians, I’m considering the t-j model (3 local states per site) with t=1 and J=0. In this limit, one recovers the U=\infty Hubbard model, where double occupation of a given site excluded from the Hilbert space. Suppose I consider open chain of L sites. Then, I have U(1) symmetry of particle number conservation and conservation of the spin pattern (ITensors allow only conservation of the total Sz). The latter symmetry implies that the Hamiltonian conserves not only the total Sz, but a…