Anyonic superconductivity in a modified large-U Hubbard model

Asim Gangopadhyaya; Prasanta K. Panigrahi

doi:10.1103/PhysRevB.44.9749

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Anyonic superconductivity in a modified large-U Hubbard model

Asim Gangopadhyaya, Prasanta K. Panigrahi

DOI 10.1103/PhysRevB.44.9749 · Physical Review B

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Abstract

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.