Yu-Shiba-Rusinov bound states versus topological edge states in Pb/Si(111)

Abstract : There is presently a tremendous activity around the field of topological superconductivity and Majorana fermions. Among the many questions raised, it has become increasingly important to establish the topological or non-topological origin of features associated with Majorana fermions such as zero-bias peaks. Here, we compare in-gap features associated either with isolated magnetic impurities or with magnetic clusters strongly coupled to the atomically thin supercon-ductor Pb/Si(111). We study this system by means of scanning tun-neling microscopy and spectroscopy (STM/STS). We take advantage of the fact that the Pb/Si(111) monolayer can exist either in a crystal-ordered phase or in an incommensurate disordered phase to compare the observed spectroscopic features in both phases. This allows us to demonstrate that the strongly resolved in-gap states we found around the magnetic clusters in the disordered phase of Pb have a clear topo-logical origin.
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Submitted on : Wednesday, April 10, 2019 - 12:41:20 PM
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Gerbold Ménard, Christophe Brun, Raphaël Leriche, Mircea Trif, François Debontridder, et al.. Yu-Shiba-Rusinov bound states versus topological edge states in Pb/Si(111). The European Physical Journal. Special Topics, EDP Sciences, 2019, 227 (15-16), pp.2303-2313. ⟨10.1140/epjst/e2018-800056-3⟩. ⟨hal-02095315⟩



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