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VOLUME 86 (2007) | ISSUE 12 | PAGE 884
Flattening of Single-Particle Spectra in Strongly Correlated Electron Systems and the Violation of the Wiedemann-Franz Law
PACS: 71.10.Hf, 71.27.+a
Abstract
The renormalization of the Wiedemann-Franz (WF) ratio in strongly correlated electron systems is analyzed within the Landau quasiparticle picture. We demonstrate that the WF law is violated: (i) at the quantum critical point, where the effective mass diverges, and (ii) beyond a point of fermion condensation, where the single-particle spectrum ε(p) becomes flat. Results of the analysis are compared with available experimental data.