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Physical review. B, Condensed matter

Bond-charge coulomb repulsion in peierls-hubbard models

David K Campbell, J. Tinka Gammel, Eugene Loh

Published Dec 1, 1988• 60 citations
Publisher

Abstract

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.

DOI
10.1103/physrevb.38.12043

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We investigate the general applicability of the standard Peierls-Hubbard model, involving both on-site (UUU) and nearest-neighbor (VVV) Coulomb repulsions, by adding nearest-neighbor off-diagonal terms representing the bond (WWW) and mixed bond-site (XXX) electron-electron repulsive interactions. For a broad range of the site-diagonal Hubbard parameters (U,VU,VU,V), we find that the off-diagonal terms (W,XW,XW,X) initially enhance dimerization, thereby stabilizing the dimerized ground state.
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