Volume 69, Number 4, February 2005
|Page(s)||616 - 622|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||14 January 2005|
Breakdown of the Luttinger sum rule at the Mott-Hubbard transition in the one-dimensional - Hubbard model
Fakultät 7, Theoretische Physik, University of the Saarland 66041 Saarbrücken, Germany
2 Department of Physics, University of California, San Diego 9500 Gilman Drive, MC0374, La Jolla, CA 92093, USA
3 Forschungszentrum Karlsruhe, Institut für Nanotechnologie Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Accepted: 8 December 2004
We investigate the momentum distribution function near the Mott-Hubbard transition in the one-dimensional t1-t2 Hubbard model (the zigzag Hubbard chain) with the density matrix renormalization group technique. We show that for strong interactions the Mott-Hubbard transition occurs between the metallic phase and an insulating dimerized phase with incommensurate spin excitations, suggesting a decoupling of magnetic and charge excitations not present in weak coupling. We illustrate the signatures for the Mott-Hubbard transition and the commensurate-incommensurate transition in the insulating spin-gaped state in their respective ground-state momentum distribution functions.
PACS: 75.10.Jm – Quantized spin models / 75.40.Mg – Numerical simulation studies
© EDP Sciences, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.