Higher-Order Topological Phases in Point-Group Symmetric Superconductors

The search of platforms hosting Majorana zero modes is one of the central issues to achieving topological qubits. One of the newest venues explored to this end is higher-order topological superconductivity. In this talk, we consider a point-group symmetric quantum anomalous Hall system with proximity-induced s-wave superconductivity, that is well-known to host chiral/helical Majorana edge states. We find that as we tune the parameters of chemical potential and superconducting pairing magnitude, higher-order topological Majorana states arise at the corners of the system protected by the underlying rotational point-group symmetry. We further discuss a method to probe the stability and transport properties of these emergent corner states so as to provide a connection with experimental realizations. Our results point to a parallel path to engineer and manipulate Majorana fermions in topological superconductors with point-group symmetries.