Fermi arc mediated entropy transport in topological semimetals

Topological Weyl semimetals can be viewed as three –dimensional analogs of graphene but richer. They have three main characteristics: (a) monopoles of Berry curvature in momentum space at nodal points with opposite chirality; (b) linearly dispersing fermions emanating from these nodal points; (c) Fermi arcs that terminate on the projections of Weyl nodes on the two surfaces. I will discuss how Fermi arcs on the surface couple with the bulk to create a channel for entropy transport driven by circulating electronic currents in an externally applied magnetic field but with no net charge transport. This work provides the first proposed signature of Fermi arc-mediated thermal transport and sets the stage for utilizing and manipulating the topological Fermi arcs in experimental thermal applications.