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

  • Gerbold C. Ménard
  • Christophe Brun
  • Raphaël Leriche
  • Mircea Trif
  • François Debontridder
  • Dominique Demaille
  • Dimitri Roditchev
  • Pascal SimonEmail author
  • Tristan Cren
Regular Article
  • 26 Downloads
Part of the following topical collections:
  1. Non-equilibrium Dynamics: Quantum Systems and Foundations of Quantum Mechanics

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 superconductor Pb/Si(111). We study this system by means of scanning tunneling 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 topological origin.

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Copyright information

© EDP Sciences, Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Gerbold C. Ménard
    • 1
    • 2
  • Christophe Brun
    • 1
  • Raphaël Leriche
    • 1
  • Mircea Trif
    • 3
    • 4
  • François Debontridder
    • 1
  • Dominique Demaille
    • 1
  • Dimitri Roditchev
    • 1
    • 5
  • Pascal Simon
    • 3
    Email author
  • Tristan Cren
    • 1
  1. 1.Institut des Nanosciences de Paris, Université Pierre et Marie Curie (UPMC), CNRS-UMR 7588ParisFrance
  2. 2.Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of CopenhagenCopenhagenDenmark
  3. 3.Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-SaclayOrsay CedexFrance
  4. 4.Institute for Interdisciplinary Information Sciences, Tsinghua UniversityBeijingP.R. China
  5. 5.Laboratoire de physique et d’étude des matériaux, LPEM-UMR8213/CNRS-ESPCI ParisTech-UPMCParisFrance

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