Wave packet dynamics in the one-dimensional extended Hubbard model

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 ex...

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Bibliographic Details
Published inarXiv.org
Main Authors Al-Hassanieh, K A, Rincon, Julian, Dagotto, E, Alvarez, G
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 19.09.2013
Subjects
Coupling
Electrons
Physics - Mesoscale and Nanoscale Physics
Physics - Strongly Correlated Electrons
Separation
Time dependence
Wave packets
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1309.5119