Majorana Corner States of Topological Edge Superconductors

Majorana bound states often occur at an end of a topological superconductor or at the Pi Josephson Junction mediated by a helical edge state. Here we show that there can emerge one Majorana Kramers pair at a corner of a finite-size quantum spin Hall insulator proximity coupled to an extended s-wave superconductor. We obtain a phase diagram that emphasizes the roles of chemical potential, order parameters, and edge orientations. Our scheme offers a unique platform and opens a new perspective for exploring non-Abelian quasiparticles and topological quantum computing.