Physical Review B
A modified large-U Hubbard model at half filling is analyzed by a mean-field approach. Preserving a local U(1) symmetry of the action, the fluctuations about half filling are studied in the spirit of the commensurate-flux-phase condition. The fluctuations then contribute a Chern-Simons term to the tree-level Lagrangian with a coefficient appropriate to that of a half fermion. With the Coulomb repulsion term, we study the low-energy excitations of the model and show the existence of superconductivity in the presence of a four-Fermi interaction term.
Gangopadhyaya, A. and Sukhatme, U.P. (1991). Anyonic superconductivity in a modified large-U Hubbard model. Physical Review B, 44(17), 9749-52.
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© American Physical Society, 1991.