Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki
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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2015, Volume 102, Issue 12, Pages 943–950
DOI: https://doi.org/10.7868/S0370274X15240091 (Mi jetpl4821) 		 
This article is cited in 3 scientific papers (total in 3 papers)

CONDENSED MATTER

Fate of the Wiedemann–Franz law near quantum critical points of electron systems in solids

V. A. Khodelab, J. W. Clarkcb, V. R. Shaginyand, M. V. Zverevae

a National Research Centre “Kurchatov Institute”, 123182 Moscow, Russia
b McDonnell Center for the Space Science and Department of Physics, Washington University, MO 63130 St. Louis, USA
c Centro de Ciências Matemáticas, Universidade de Madeira, 9000-390 Funchal, Madeira, Portugal
d Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, 188300 Gatchina, Russia
e Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
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DOI: https://doi.org/10.7868/S0370274X15240091
Abstract: We introduce and analyze two different scenarios for violation of the Wiedemann–Franz law in strongly correlated electron systems of solids, close to a topological quantum critical point (TQCP) where the density of states $N(0)$ diverges. The first, applicable to the Fermi-liquid (FL) side of the TQCP, involves a transverse zero-sound collective mode that opens a new channel for the thermal conductivity, thereby enhancing the Lorenz number $L(0)$ relative to the value $L_0=\pi^2k^2_{\mathrm{B}}/3e^2$ dictated by conventional FL theory. The second mechanism for violation of the WF law, relevant to the non-Fermi-liquid (NFL) side of the TQCP, involves the formation of a flat band and leads instead to a reduction of the Lorenz number.
Funding agency Grant number
Russian Foundation for Basic Research 13-02-00085_à
15-02-06261_à
Ministry of Education and Science of the Russian Federation ÍØ-932.2014.2
This research was partially supported by RFBR grants #13-02-00085 and 15-02-06261 and by grant #NS-932.2014.2 from the Russian Ministry of Sciences. V.R.S. was supported by the Russian Science Foundation (Grant #14-22-00281).
Received: 06.11.2015
English version:
Journal of Experimental and Theoretical Physics Letters, 2015, Volume 102, Issue 12, Pages 826–833
DOI: https://doi.org/10.1134/S0021364015240066
Bibliographic databases:
Document Type: Article
Language: English
Citation: V. A. Khodel, J. W. Clark, V. R. Shaginyan, M. V. Zverev, “Fate of the Wiedemann–Franz law near quantum critical points of electron systems in solids”, Pis'ma v Zh. Èksper. Teoret. Fiz., 102:12 (2015), 943–950; JETP Letters, 102:12 (2015), 826–833
Citation in format AMSBIB
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\paper Fate of the Wiedemann--Franz law near quantum critical points of electron systems in solids
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