Revealing Hinge Modes in 2D Magnetic Topological Superconductor via Macroscopic Non-Local Transport

A key signature of topological boundary modes, namely a non-local response [1,2], has remained elusive in topological superconductors(TSC). Here we focus on 1D higher-order TSC (HOTSC) chiral modes in FeTe_0.55Se_0.45, demonstrating they mediate non-local transport over macroscopic distances, owing to the topological-protection long-term coherence. We found the hinge-mediated transport 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 FeTe_0.55Se_0.45, providing a new methodology to explore TSC [3,4].
[1] Serban, I. et al., Physical review letters 104, 147001 (2010)
[2] Zhang, Y.-T. et al., Physical Review B 95, 245433 (2017)
[3] Qi, X.-L. & Zhang, S.-C. Reviews of Modern Physics 83, 1057 (2011).
[4] Read, N. & Green, D. Physical Review B 61, 10267 (2000)