Bose condensation and electron pairing in one-dimensional Hubbard model
學年 88
學期 1
出版(發表)日期 1999-12-20
作品名稱 Bose condensation and electron pairing in one-dimensional Hubbard model
著者 Kocharian, A. N.; 楊棨; Yang, Chi; Chiang, Y. L.
單位 淡江大學物理學系
出版者 World Scientific Publishing
著錄名稱、卷期、頁數 International Journal of Modern Physics B 13(29-31), pp.3538-3545
摘要 The ground-state properties in one-dimensional Hubbard model with on-site attraction and repulsion of electrons in the presence of magnetic field h are calculated by means of the exact Bethe-ansatz formalism and the generalized self-consistent field (GSCF) approach for general electron concentrations n and arbitrary interaction strength. The ground-state properties, including the energy, the average spin (magnetization) and the kinetic energy are compared over a wide range of parameter space. The GSCF theory is in qualitative and in some cases in good quantitative agreement with the exact results. The GSCF theory at U≤0 (or U≥0) differentiates the spin (or charge) energy gap from the BCS (or antiferromagnetic) order parameter and suggests a smooth crossover from the phase with the itinerant BCS-like behavior to the Bose condensation regime of the local pairs.
關鍵字 Hubbard model;Ground-state;Bethe-ansatz;BCS pairing;Electron-hole pairing;Bose condensation;Crossover
語言 en
ISSN 0217-9792
期刊性質 國外
國別 SGP
出版型式 ,紙本

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