Thermal and electrical signatures of a hydrodynamic electron fluid in WP2

Wednesday, June 5, 2019 - 9:30am - 10:30am
Lind 409
Fabian Menges (University of Colorado)
In this talk, I will present thermal and magneto-electric transport experiments on heat and charge flow in the Weyl semimetal tungsten diphosphide (WP2). We observe a strong violation of the Wiedemann-Franz law that coincides with a transition from a conventional metallic state at high temperatures to a hydrodynamic electron fluid below 20 K. The hydrodynamic regime is characterized by a viscosity-induced dependence of electrical resistivity on the sample width and magnetic field. Based on the accompanying decoupling of momentum conserving and relaxing scattering processes we show evidence that both thermal and electrical transport are bound by the quantum indeterminacy applied to energy dissipation, independent of the underlying transport regime.