Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-07-05
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 10 figures
Scientific paper
10.1103/PhysRevB.66.075117
We have studied the influence of nearest-neighbor (NN) repulsion on the low frequency phase diagram of a quarter-filled Hubbard-Holstein chain. The NN repulsion term induces the apparition of two new long range ordered phases (one $4k_F$ CDW for positive $U_{eff} = U-2g^2/\omega$ and one $2k_F$ CDW for negative $U_{eff}$) that did not exist in the V=0 phase diagram. These results are put into perspective with the newly observed charge ordered phases in organic conductors and an interpretation of their origin in terms of electron-molecular vibration coupling is suggested.
Lepetit Marie-Bernadette
Maurel Philippe
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