Re-integerization of fractional charges in the correlated quarter-filled band |
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Authors: | Clay R T Mazumdar S Campbell D K |
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Institution: | Department of Physics, University of Arizona, Tucson, Arizona 85721, USA. |
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Abstract: | Previous work has demonstrated the existence of soliton defect states with charges +/-e/2 in the limits of zero and infinite on-site Coulomb interactions in the one-dimensional (1D) quarter-filled band. For large but finite on-site Coulomb interaction, the low temperature 2kF bond distortion that occurs within the 4kF 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 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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