Browsing by Author "Yi-Chen Cheng"

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任意電子密度兩原子哈伯模式的費米能階及磁感性
(1976-12)
鄭以禎
;
王淑霞
;
Yi-Chen Cheng
;
Shu-Hsia Chen
The eigenvalue problem of a two-site Hubbard Hamiltonian, which contains sboth the correlation term U and the hopping term t , is solved exactly and the grand partition function of the system is obtained. The chemical potential as a function of temperature for a given number of electrons per site n is numerically calculated for several values of n.The chemical potential as a function of n at absolute zero is shown to have three discontinuouties at n=1/2,1,and 3/2. The magnetic suspectibility per site is shown to be of the Curie-Weiss form for the temperature range t<