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., 2007, Volume 86, Issue 12,Pages <nobr>884

This article is cited in 3 papers

CONDENSED MATTER

Flattening of Single-Particle Spectra in Strongly Correlated Electron Systems and the Violation of the Wiedemann-Franz Law

V. A. Khodel^ab, V. M. Yakovenko^c, M. V. Zverev^a

^a Russian Research Centre "Kurchatov Institute"
^b McDonnell Center for the Space Science and Department of Physics, Washington University, St.Louis, MO 63130, USA
^c Matter Theory Center and Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA

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.

PACS: 71.10.Hf, 71.27.+a

Received: 07.11.2007

Language: English