Document Type

Article

Publication Date

11-1-1991

Publication Title

Physical Review B

Volume

44

Issue

17

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.

Comments

Author Posting. © American Physical Society, 1991. This article is posted here by permission of American Physical Society for personal use, not for redistribution. It was published in Physical Review B, Vol. 44, No. 17, (1991). http://dx.doi.org/10.1103/PhysRevB.44.9749

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License.

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