@Article{KCSZ15,
  author         = {Khodel, V. A. and Clark, J. W. and Shaginyan, V. R. and Zverev, M. V.},
  title          = {{Fate of the Wiedemann-Franz law near quantum critical points of electron systems in solids}},
  journal        = {JETP Letters},
  year           = {2015},
  volume         = {102},
  number         = {12},
  pages          = {826--833},
  month          = nov,
  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 $L_0=\pi^2k^2_B/3e^2$ 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.},
  comments       = {7 pages, 1 figure},
  eprint         = {1511.02213},
  oai2identifier = {1511.02213},
  url            = {http://arxiv.org/abs/1511.02213},
}