Low density electron pairs in the extended hubbard model

機構典藏 > College of Sciences > Graduate Institute & Department of Physics > Journal Article > Item 987654321/27923

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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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