Wiedemann-Franz law

Wednesday, June 5, 2019 - 9:30am - 10:30am
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.
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