Title: Signatures of propagating Majorana modes measured by scanning tunneling spectroscopy
Vidya Madhavan, University of Illinois, Urbana-Champaign
Absract: Topological superconductors represent a fundamentally new phase of matter. Similar to topological insulators, the non-trivial topological characteristics of a topological superconductor dictate the presence of a topological edge states composed of Bogoliubov quasiparticles which live inside and span the superconducting gap. The intense interest in these materials stems from the fact that Bogoliubov excitations inside the gap of a topological superconductor are predicted to have all the characteristics of Majorana Fermions. This talk will describe recent developments in two classes of topologically non-trivial superconductors: bulk topological superconductors, and proximitized topological insulators where an effective time-reversal invariant generalization of p+ip superconductivity can be realized. I will show low temperature scanning tunneling microscopy measurements on two materials that are representative of these two classes: FeSexTe1x which is thought to be an example of an intrinsic proximitized topological insulator and UTe2, which may be a bulk topological superconductor. I will show and discuss the signatures of Majorana bound states as well as chiral dispersing Majorana modes in these systems.
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