Supernonlocality in a Weyl metal

We report on the discovery of a macroscopic quantum phenomenon, referred to as supernonlocality, in the Weyl state-a topological metal exhibiting both surface and bulk topological transport. Supernonlocality is characterized by a comparable magnitude of nonlocal resistance to local resistance, indicating a global transport property. Remarkably, we observe a colossal nonlocal decay length of 0.6 mm, surpassing other semimetals in terms of nonlocal phenomena. This unprecedented behavior is found to be positively correlated with the system's nonlinear conductivity, suggesting that macroscopic supernonlocality arises from chiral charge pumping through a one-dimensional topological channel. Our findings provide insight into the manifestation of macroscopic quantum phenomena in topological metals and pave the way for the development of topological nonlocal electronics.