Quantized charge transport in chiral Majorana edge modes

Abstract

Lattices of magnetic adatoms deposited on the surface of $s$-wave superconductors (Shiba lattices) have been proposed as a new platform for topological superconductivity, allowing for the local manipulation and detection of Majorana modes via scanning-probe techniques. The authors demonstrate that the topological Majorana edge modes of nanoscopic Shiba islands display universal electronic and transport properties. Most remarkably, these Majorana modes possess a quantized charge conductance that is proportional to the topological Chern number ($C$), and carry a supercurrent whose chirality reflects the sign of $C$. These results establish nanoscopic Shiba islands as promising components in future topology-based devices.