Low density electron pairs in the extended hubbard model

淡江大學機構典藏 > 理學院 > 物理學系暨研究所 > 期刊論文 > Item 987654321/27923

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題名:	Low density electron pairs in the extended hubbard model
作者:	Lin, H. Q.;Lau, W. C.;陳惟堯;Chen, Wei-yeu
貢獻者:	淡江大學物理學系
關鍵詞:	Many-body quasiparticle theories;Computer simulations
日期:	1997-10-15
上傳時間:	2009-12-31 10:52:42 (UTC+8)
出版者:	Elsevier
摘要:	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.
關聯:	Synthetic metals 90(1), pp.77-79
DOI:	10.1016/S0379-6779(97)81230-1
顯示於類別:	[物理學系暨研究所] 期刊論文

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