Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-08-02
Phys. Rev. B 63, 125116 (2001).
Physics
Condensed Matter
Strongly Correlated Electrons
13 pages, 19 figures
Scientific paper
10.1103/PhysRevB.63.125116
Local moment formation driven by the on--site repulsion $U$ is one of the most fundamental features in the Hubbard model. At the simplest level, the temperature dependence of the local moment is expected to have a single structure at $T \sim U$, reflecting the suppression of the double occupancy. In this paper we show new low temperature Quantum Monte Carlo data which emphasize that the local moment also has a signature at a lower energy scale which previously had been thought to characterize only the temperatures below which moments on {\it different} sites begin to correlate locally. We discuss implications of these results for the structure of the specific heat, and connections to quasiparticle resonance and pseudogap formation in the density of states.
Huscroft Carey
McMahan A. K.
Paiva Thereza
Scalettar Richard T.
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