Effect of nearest neighbor repulsion on the low-frequency phase diagram of a quarter-filled Hubbard-Holstein chain

Article

关键词: CHARGE-DENSITY-WAVE;    4PF INSTABILITIES;    ORGANIC CONDUCTOR;    WIGNER CRYSTAL;    SMALL POLARON;    STATE;    ELECTRON;    BAND;    MODEL;    DCNQI;   

DOI  :  10.1103/PhysRevB.66.075117

来源: SCIE

【 摘 要 】

We have studied the influence of nearest-neighbor (NN) repulsions 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 phases 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.

【 授权许可】

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