It was first shown in 2010 that a single atomic layer of Pb deposited on top of a Si substrate becomes superconducting at low temperature. This purely two-dimensionnal system is an ideal platform for scanning tunneling experiments on superconductors. In particular, due to the presence of spin-orbit at the interface, topological superconductivity can be induced in such system. By forming Co nanoclusters below the Pb layer,the Co magnetism can induce a region of topological superconductivity with associated edge states. I will present our study of this system and in particular the topological edge states and bound states that we observed and compare them with the trivial signatures of magnetism in the same system.
 G. Ménard et al., Two-dimensional topological superconductivity in Pb/Co/Si(111), Nature comm. 8, 2040 (2017).
 G. Ménard et al., Isolated pairs of Majorana zero modes in a disordered superconducting lead monolayer, arXiv:1810.09541 (2018).
|Choix de session parallèle||3.3 Propriétés remarquables des matériaux topologiques : de la théorie à la réalisation expérimentale|