Regensburg 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 27: Transport in Materials: Diffusion, Charge or Heat Conduction
MM 27.7: Vortrag
Donnerstag, 20. März 2025, 12:00–12:15, H22
Sublinear in temperature transport in kagome metals: interplay of Dirac cones and Van Hove singularities — •Nikolai Peshcherenko1, Ning Mao1, Claudia Felser1, and Yang Zhang2,3 — 1Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany — 2Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA — 3Min H. Kao Department of Electrical Engineering and Computer Science, University of Tennessee, Knoxville, Tennessee 37996, USA
Kagome metals are known to host Dirac fermions and saddle point Van Hove singularities near Fermi level. With the minimal two-pocket model (Dirac cone + Van Hove singularity), we propose a semiclassical theory to explain the experimentally observed sublinear resistivity in Ni3In and other Kagome metals. We derive the full semiclassical description of kinetic phenomena using Boltzmann equation, and demonstrate that internode electron-electron interaction leads to sublinear in T scaling for both electrical and thermal transport at low temperatures. At higher temperatures above the Dirac node chemical potential, thermal and electric currents dissipate through distinct scattering channels, making a ground for Wiedemann-Franz law violation.
Keywords: Van Hove singularities; Non-Fermi liquid behavior; Kagome metal; Quantum transport; Wiedemann-Franz law violation