Re-integerization of fractional charges in the correlated quarter-filled band

Abstract

Previous work has demonstrated the existence of soliton defect states with charges +/- e/2 in the limits of zero and of infinite on-site Coulomb interactions in the one-dimensional (1D) quarter-filled band. For large but finite on-site Coulomb interaction, the low temperature 2k_F bond distortion that occurs within the 4k_F bond-distorted phase is accompanied by charge-ordering on the sites. We show that a ``re-integerization'' of the defect charge occurs in this bond-charge density wave (BCDW) state due to a ``binding'' of the fractional charges. We indicate briefly possible implications of this result for mechanisms of organic superconductivity.

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References in corpus (4)

• Charge ordering in the TMTTF family of molecular conductors
• Dielectric response of charge induced correlated state in the quasi-one-dimensional conductor (TMTTF)2PF6
• Bond and charge density waves in the isotropic interacting two-dimensional quarter-filled band and the insulating state proximate to organic superconductivity
• Small Bipolarons in the 2-dimensional Holstein-Hubbard Model. II Quantum Bipolarons

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