| Issue |
Europhys. Lett.
Volume 69, Number 4, February 2005
|
|
|---|---|---|
| Page(s) | 616 - 622 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2004-10379-x | |
| Published online | 14 January 2005 | |
Breakdown of the Luttinger sum rule
at the Mott-Hubbard transition
in the one-dimensional 
-
Hubbard model
1
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
Received:
21
September
2004
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
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