Fractionnally charged excitations in the charge density wave state of a quarter-filled t-J chain with quantum phonons

Abstract

Elementary excitations of the 4k${}_F$ 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 4k${}_F$ charge density wave instability in $(\mathrm{DI}-\mathrm{DCNQI}{)}_2\mathrm{Ag}$ or recently discovered in (TMTTF)${}_2$X (X=PF${}_6$, AsF${}_6$) is discussed.

4 pages, 4 figures

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