2015/11/06 by V. A. Khodel, J. W. Clark, V. R. Shaginyan +1 · 2 citations
Physics and Astronomy · #Electron #Mode (computer interface) #Multistability #Physics of Superconductivity and Magnetism #Point (geometry) #Quantum #Quantum system #Rare-earth and actinide compounds #Thermal #Topological Materials and Phenomena #Value (mathematics) #cond-mat.str-el
paper · pdf · doi:10.1134/s0021364015240066
published in Journal of Experimental and Theoretical Physics Letters 102(12), 826-833 (Pleiades Publishing) · 7 pages, 1 figure
arxiv created 2015/11/06 · openalex publication_date 2015/12/01 · arxiv updated 2016/03/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 L0 =π2 k B 2/3e 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.