Title: Critical Percolation Without Fine Tuning on the Surface of a Topological Superconductor,
Abstract: We present numerical evidence that most two-dimensional surface states of a
bulk topological superconductor (TSC) sit at an integer quantum Hall plateau
transition. We study TSC surface states in class CI with quenched disorder.
Low-energy (finite-energy) surface states were expected to be critically
delocalized (Anderson localized). We confirm the low-energy picture, but find
instead that finite-energy states are also delocalized, with universal
statistics that are independent of the TSC winding number, and consistent with
the spin quantum Hall plateau transition (percolation).