Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-03-08
Computing Letters (CoLe), vol.3 no. 2-4, pp. 457-472, 2007
Physics
Condensed Matter
Strongly Correlated Electrons
18 pages, 7 figures, slightly re-written and modified with respect to the published version
Scientific paper
In this paper, we address the role of electron-electron interactions on the velocities of spin and charge transport in one-dimensional systems typified by conjugated polymers. We employ the Hubbard model to model electron-electron interactions. The recently developed technique of time dependent Density Matrix Renormalization Group (tdDMRG) is used to follow the spin and charge evolution in an initial wavepacket described by a hole doped in the ground state of the neutral system. We find that the charge and spin velocities are different in the presence of correlations and are in accordance with results from earlier studies; the charge and spin move together in the noninteracting picture while interaction slows down only the spin velocity. We also note that dimerization of the chain only weakly affects these velocities.
Dutta Tirthankar
Ramasesha S.
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