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Braiding Majorana zero modes is essential for fault-tolerant topologicalquantum computing. Iron-based superconductors with nontrivial band topologyhave recently emerged as a surprisingly promising platform for creatingdistinct Majorana zero modes in magnetic vortices in a single material and atrelatively high temperatures. The magnetic field-induced Abrikosov vortexlattice makes it difficult to braid a set of Majorana zero modes or to studythe coupling of a Majorana doublet due to overlapping wave functions. Here wereport the observation of the proposed quantum anomalous vortex with integerquantized vortex core states and the Majorana zero mode induced by magnetic Feadatoms deposited on the surface. We observe its hybridization with a nearbyfield-induced Majorana vortex in iron-based superconductor FeTe0.55Se0.45. Wealso observe vortex-free Yu-Shiba-Rusinov bound states at the Fe adatoms with aweaker coupling to the substrate, and discover a reversible transition betweenYu-Shiba-Rusinov states and Majorana zero mode by manipulating the exchangecoupling strength. The dual origin of the Majorana zero modes, from magneticadatoms and external magnetic field, provides a new single-material platformfor studying their interactions and braiding in superconductors bearingtopological band structures.

Observation of magnetic adatom-induced Majorana vortex and its hybridization with field-induced Majorana vortex in an iron-based superconductor