Purity-dependent Lorenz number, electron hydrodynamics and electron-phonon coupling in WTe${}_2$

Wei Xie, Feng Yang, Liangcai Xu +3

We present a study of electrical and thermal transport in Weyl semimetal WTe${}_2$ down to 0.3 K. The Wiedemann-Franz law holds below 2 K and a downward deviation starts above. The d…