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VOLUME 72 (2000) | ISSUE 2 | PAGE 115
Exact singlet bond ground states for electronic models
PACS: 75.10.Jm
We proposed several ID and 2D electronic models with the exact ground state. The ground state wave function of these models is represented in terms of 'singlet bond* functions consisting of homopolar and ionic configurations. The Hamiltonians of these models include correlated hopping of electrons, pair hopping terms and spin interactions.