教師資料查詢 | 類別: 期刊論文 | 教師: 陳惟堯 CHEN, WEI-YEU (瀏覽個人網頁)

標題: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
語言英文
ISSN0379-6779
期刊性質國外
收錄於
產學合作
通訊作者
審稿制度
國別瑞士
公開徵稿
出版型式,紙本
相關連結
Google+ 推薦功能,讓全世界都能看到您的推薦!