Majorana corner states in D class*

Majorana corner states (MCSs) in D class can naturally form a topological qubit. In this talk, we show that how to realize MCSs in two-dimensional topological insulators in the presence of both superconductivity and magnet. It is noted that there is only one MCS at each corner which is allowed due to the time-reversal symmetry broken. An edge theory is performed to clearly demonstrate the physics behind these results. At last, we study the spin property of MCSs and propose to use spin-resolved scanning tunneling microscope to detect their existence.