We investigate the general applicability of the standard Peierls-Hubbard model, involving both on-site (U) and nearest-neighbor (V) Coulomb repulsions, by adding nearest-neighbor off-diagonal terms representing the bond (W) and mixed bond-site (X) electron-electron repulsive interactions. For a broad range of the site-diagonal Hubbard parameters ($U,V$), we find that the off-diagonal terms ($W,X$) initially enhance dimerization, thereby stabilizing the dimerized ground state.
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Campbell et al. (1988) studied this question.
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