Wave-packet dynamics in the one-dimensional extended Hubbard model

K. A. Al-Hassanieh, Julián Rincón, E. Dagotto, G. Alvarez

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Using the time-dependent density-matrix renormalization group, we study the time evolution of electronic wave packets in the one-dimensional extended Hubbard model with on-site and nearest-neighbor repulsion, U and V, respectively. As expected, the wave packets separate into spin-only and charge-only excitations (spin-charge separation). Charge and spin velocities exhibit nonmonotonic dependence on V. For small and intermediate values of V, both velocities increase with V. However, the charge velocity exhibits a stronger dependence than that of the spin, leading to a more pronounced spin-charge separation. Charge fractionalization, on the other hand, is weakly affected by V. The results are explained in terms of Luttinger liquid theory in the weak-coupling limit and an effective model in the strong-coupling regime.

Original languageEnglish (US)
Article number045107
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number4
DOIs
StatePublished - Jul 3 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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