Yu-Shiba-Rusinov states and chiral Majorana modes on an iron-based superconductor with a surface Dirac cone

Magnetic impurities on the surface of the superconductor lead to unusual low-energy physics. A magnetic adatom induces in-gap Yu-Shiba-Rusinov states. Particularly, for the s-wave superconductor possessing a surface Dirac cone, chiral Majorana modes emerge on the edge of the magnetic island. To establish the connection between Shiba and Majorana physics, we study the low-energy physics of the magnetic impurities on the surface of FeTexSe1−x with a Dirac cone. We show the evolution of the Yu-Shiba-Rusinov states and the transition to chiral Majorana modes as the Fe exchange coupling varies.