Low density electron pairs in the extended hubbard model
學年 86
學期 1
出版（發表）日期 1997-10-15
作品名稱 Low density electron pairs in the extended hubbard model
作品名稱（其他語言）
著者 Lin, H. Q.; Lau, W. C.; 陳惟堯; Chen, Wei-yeu
單位 淡江大學物理學系
出版者 Elsevier
著錄名稱、卷期、頁數 Synthetic metals 90(1), pp.77-79
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.
關鍵字 Many-body quasiparticle theories;Computer simulations
語言 en
ISSN 0379-6779
期刊性質 國外
收錄於
產學合作
通訊作者
審稿制度 否
國別 CHE
公開徵稿
出版型式 ,紙本
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