Configuration interaction method for model Hamiltonian clusters

Kanhere, D. G. ; Arjunwadkar, Mihir (1991) Configuration interaction method for model Hamiltonian clusters Solid State Communications, 77 (8). pp. 613-616. ISSN 0038-1098

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Ground state energies of the Hubbard-Hamiltonian defined on small clusters have been obtained using configuration interaction like methods. It is shown that it is convenient to choose between a single-particle-energy basis and the site basis depending upon the range of Hubbard U. The method is illustrated on six- to nine-site clusters of ring geometry for a half-filled band. The results indicate that it is possible to pickup about 70 to 80% of the ground state energy for appropriate ranges of the Hubbard U parameter with reduced number of multiparticle basis states.

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ID Code:16276
Deposited On:15 Nov 2010 13:56
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