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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/27923

    Title: Low density electron pairs in the extended hubbard model
    Authors: Lin, H. Q.;Lau, W. C.;陳惟堯;Chen, Wei-yeu
    Contributors: 淡江大學物理學系
    Keywords: Many-body quasiparticle theories;Computer simulations
    Date: 1997-10-15
    Issue Date: 2009-12-31 10:52:42 (UTC+8)
    Publisher: Elsevier
    Abstract: We study the extended Hubbard model in the parameter region where it exhibits superconducting instabilities. The model is defined by onsite and nearest-neighbor Coulomb interactions U and V, and hopping integral t. We calculate pair binding energies for various finite clusters by performing exact diagonalization of the Hamiltonian. We show results for one-dimensional chains and discuss results for 4 × 4, 6 × 6, and 8 × 8 two-dimensional square lattices. Results of solving the BCS equation for the pair binding energy as functions of carrier density n, and Coulomb interactions U and V, are compared with the exact diagonalization results. In the dilute concentration limit (n → 0), the BCS equation is expected to be exact and, in the low electron density region, the results for the pair binding energy are found to be in fairly good agreement with the exact solutions.
    Relation: Synthetic metals 90(1), pp.77-79
    DOI: 10.1016/S0379-6779(97)81230-1
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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