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LOCAL APPROACH FOR THE EXTENDED HUBBARD MODEL

NIE HUI-QUAN WEI GUO-ZHU ZHANG KAI-YI

LOCAL APPROACH FOR THE EXTENDED HUBBARD MODEL

NIE HUI-QUAN, WEI GUO-ZHU, ZHANG KAI-YI
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(PLEASE TRANSLATE TO ENGLISH

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  • Received Date:  24 April 1987
  • Published Online:  06 July 2005

LOCAL APPROACH FOR THE EXTENDED HUBBARD MODEL

  • 1. 东北工学院物理系

Abstract: In this paper, using the local approach, we calculated the correlation energy, the local moments and the polarisation around the local moments in paramagnetic phase up to second order in the extended Hubbard model. It is shown that the polarisation is always antiferro-magnetic for different values of W. The correlation energy increases with W increasing for n = 1 and large U. The local moments and the antiferromagnetic polarisation decrease with W increasing for fixed n and U. While the effect of W on both the local moments and the antiferromagnetic polarisation is not obvious for small n or for large U and n = 1.

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