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1 E2 - Spectroscopie des nouveaux états quantiques INSP - Institut des Nanosciences de Paris 2 LPS - Laboratoire de Physique des Solides d-Orsay 3 IPHT - Institut de Physique Théorique - UMR CNRS 3681 4 E8 - Croissance et propriétés de systèmes hybrides en couches minces INSP - Institut des Nanosciences de Paris 5 LPEM - Laboratoire de Physique et d-Etude des Matériaux

Abstract : Just like insulators can host topological Dirac states at their edges, superconductors can also exhibit topological phases characterized by Majorana edge states. Remarkable zero-energy states have been recently observed at the two ends of proximity induced superconducting wires 1, 2, and were interpreted as localized Majorana end states in one-dimensional 1D topological superconductor. By contrast, propagating Majorana states should exist at the 1D edges of two-dimensional 2D topological superconductors. Here we report the direct observation of dispersive in-gap states surrounding topological superconducting domains made of a single atomic layer of Pb covering magnetic islands of Co-Si111. We interpret the observed continuous dispersion across the superconducting gap in terms of a spatial topological transition accompanied by a chiral edge mode and residual gaped helical edge states. Our experimental approach enables the engineering and control of a large variety of novel quantum phases. This opens new horizons in the field of quantum materials and quantum electronics where the magnetization of the domains could be used as a control parameter for the manipulation of topological states.

Autor: Gerbold Ménard - Sébastien Guissart - Christophe Brun - Mircea Trif - François Debontridder - Raphaël Leriche - Dominique Dem



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