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Is the $SU(2)$ flux defined in the context of Projective Symmetry Group(PSG) an observable quantity?
The $SU(2)$ flux defined in the context of PSG is as follows:
Consider the mean-field Hamiltonian $H_{MF}=\sum(\psi_i^\dagger\chi_{ij}\psi_j+H.c.)$ description of a 2D lattice spin-model, the ...