Antiferromagnetism and single-particle properties in the two-dimensional half-filled Hubbard model: Slater vs. Mott-Heisenberg
Abstract
We study antiferromagnetism and single-particle properties in the two-dimensional half-filled Hubbard model at low temperature. Collective spin fluctuations are governed by a non-linear sigma model that we derive from the Hubbard model for any value of the Coulomb repulsion. As the Coulomb repulsion increases, the ground state progressively evolves from a Slater to a Mott-Heisenberg antiferromagnet. At finite temperature, we find a metal-insulator transition between a pseudogap phase at weak coupling and a Mott-Hubbard insulator at strong coupling.
- Publication:
-
EPL (Europhysics Letters)
- Pub Date:
- September 2003
- DOI:
- 10.1209/epl/i2003-00584-7
- arXiv:
- arXiv:cond-mat/0212411
- Bibcode:
- 2003EL.....63..722B
- Keywords:
-
- 71.10.Fd;
- 71.10.Hf;
- 71.27.+a;
- Lattice fermion models;
- Non-Fermi-liquid ground states electron phase diagrams and phase transitions in model systems;
- Strongly correlated electron systems;
- heavy fermions;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- Revised version, to appear in EuroPhys. Letters (epl style included)