Non-local transport from boundary modes in magnetic topological superconductor Fe(Te, Se)

A key signature of topological boundary modes, namely a non-local response, has remained elusive in topological superconductors(TSC). Here we focus on 1D higher-order TSC (HOTSC) chiral modes in FeTe0.55Se0.45, demonstrating they mediate electron co-tunneling (EC) over macroscopic distances, owing to the topological-protection long-term coherence. We found the hinge-mediated EC emerges in an anomalous large range, and produces a robust conductance plateau. Meanwhile, such plateau is robust against increasing temperature and magnetic field, and disappear without hinge contact or topological nontrivial phase of materials. Thus, our experiments reveal the first proof of robust, long-range, and non-local response from the 1D chiral hinge modes in \ch{FeTe_{0.55}Se_{0.45}}, providing a new methodology to explore TSC.