Emergence of supersymmetry on the surface of three-dimensional topological insulators

We propose two possible experimental realizations of a ( 2 + 1)-dimensional spacetime supersymmetry at a quantum critical point on the surface of three-dimensional topological insulators. The quantum critical point between the semi-metallic state with one Dirac fermion and the s-wave superconducting state on the surface is described by a supersymmetric conformal field theory within the is an element of-expansion. We predict the exact voltage dependence of the differential conductance at the supersymmetric critical point.