%0 Journal Article
%T Wave packet dynamics in the one-dimensional extended Hubbard model
%A K. A. Al-Hassanieh
%A Julian Rincon
%A E. Dagotto
%A G. Alvarez
%J Physics
%D 2013
%I arXiv
%R 10.1103/PhysRevB.88.045107
%X Using 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 non-monotonic 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.
%U http://arxiv.org/abs/1309.5119v1