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LOCAL APPROACH IN THE HUBBARD MODEL

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

LOCAL APPROACH IN THE HUBBARD MODEL

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

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  • Received Date:  22 January 1987
  • Published Online:  04 July 2005

LOCAL APPROACH IN THE HUBBARD MODEL

  • 1. 东北工学院物理系

Abstract: Based on the intraatomic electron correlation and the interatomic electron and spin correlation, the local approach has been used to the Hubbard model. The term〈OOH〉which was neglected in the general calculation is retained in our calculation. Camparing our results with those of the general calculation, we find that when U is large, the effects of the term〈OOH〉in the paramagnetic phase can not be heglected for calculating the correlation energy, the ground state energy, the local moments and the antiferromagnetic polarization around the local moments. To estimate more accurately the electron correlation effects, one has to calculate to higher orders and check he convergency of the series.

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