Fractionnally charged excitations in the charge density wave state of a quarter-filled t-J chain with quantum phonons
Abstract
Elementary excitations of the 4kF charge density wave state of a quarter-filled strongly correlated electronic one-dimensional chain are investigated in the presence of dispersionless quantum optical phonons using Density Matrix Renormalization Group techniques. Such excitations are shown to be topological unbound solitons carrying charge e/2. Relevance to the 4kF charge density wave instability in (DI-DCNQI)2Ag or recently discovered in (TMTTF)2X (X=PF6, AsF6) is discussed.
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