Comparison of the π and ∆ operator approximations for the two-dimensional t-J model
نویسنده
چکیده
We compare the spectra of the new π operator of the SO(5) theory and the conventional ∆ operator for the two-dimensional t-J model. We also calculate the weight transferred to the two-hole ground state from half-filling by these operators. We find that the spectra of these operators are quite similar and the weight for the π operator is smaller than the weight for the ∆ operator. We argue that the two-dimensional t-J model does not have a good approximate SO(5) symmetry claimed in Ref. [1]. PACS: 71.27.+a,74.20.-z
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