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 $\epsilon(p)$ becomes flat. Results of the analysis are compared with available experimental data.
Citation:
V. A. Khodel, V. M. Yakovenko, M. V. Zverev, “Flattening of Single-Particle Spectra in Strongly Correlated Electron Systems and the Violation of the Wiedemann-Franz Law”, Pis'ma v Zh. Èksper. Teoret. Fiz., 86:12 (2007), 884–890; JETP Letters, 86:12 (2007), 772–778