Majorana Corner States of Second-Order Topological Superconductors

Majorana bound states often emerge at the ends of one-dimensional topological superconductors. Here we show that they can also appear at the corners of finite-size proximitized two-dimensional superconductors. We obtain a phase diagram that emphasizes the roles of chemical potential, order parameters, and edge orientations to achieve such second-order topological superconductors. Our scheme offers a unique platform and opens a new perspective for exploring non-Abelian quasiparticles and topological quantum computing.