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


  • Physical Review B - Condensed Matter and Materials Physics


  • 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.

publication date

  • 2013-7-3


  • 88


  • Hubbard model
  • Liquids
  • Wave packets
  • electronics
  • excitation
  • liquids
  • polarization (charge separation)
  • wave packets

International Standard Serial Number (ISSN)

  • 1098-0121