Microscopic Fingerprint of Chiral Pairing in a Single-Layer Superconductor

Chiral superconductors violate time-reversal symmetry and can host topologically protected excitations such as Majorana modes. Yet, direct microscopic evidence of chiral pairing has remained elusive. Here we combine analytical theory and large-scale numerical simulations to investigate quasiparticle interference (QPI) signatures of chiral superconductivity in a single atomic layer of tin on Si(111). Our framework predicts symmetry-locked nodal and antinodal structures in the Bogoliubov quasiparticle wavefunctions near atomic-scale defects, which give rise to distinct QPI patterns unique to chiral pairing. The experimentally observed real-space textures quantitatively match these predictions, providing compelling microscopic evidence for chiral superconductivity in a two-dimensional system. This joint theoretical and experimental effort bridges long-standing theoretical proposals with direct realization, advancing the microscopic understanding of topological superconductivity in atomically thin materials.