Fate of the Wiedemann-Franz law near quantum critical points of electron systems in solids
| Autor: | Vasily R. Shaginyan, V. A. Khodel, J. W. Clark, M. V. Zverev |
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| Rok vydání: | 2015 |
| Předmět: |
Physics
Physics and Astronomy (miscellaneous) Condensed matter physics Solid-state physics Strongly Correlated Electrons (cond-mat.str-el) FOS: Physical sciences Electron 01 natural sciences 010305 fluids & plasmas Condensed Matter - Strongly Correlated Electrons Thermal conductivity Quantum critical point 0103 physical sciences Density of states Strongly correlated material 010306 general physics Wiedemann–Franz law Quantum |
| DOI: | 10.48550/arxiv.1511.02213 |
| Popis: | 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 $L_0=\pi^2k^2_B/3e^2$ 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. Comment: 7 pages, 1 figure |
| Databáze: | OpenAIRE |
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