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We report on several low temperature experiments supporting the presence ofMajorana fermions in superconducting lead nanowires fabricated with a scanningtunneling microscope. These nanowires are the connecting bridges between theSTM tip and the sample resulting from indentation processes. We show here thatby a controlled tuning of the geometry of the nanowire region, in whichsuperconductivity is confined by applied magnetic fields, the conductancecurves obtained in these situations are indicative of topologicalsuperconductivity and Majorana fermions. The most prominent feature of thisbehavior is the emergence of a zero bias peak in the conductance curves,superimposed on a background characteristic of the conductance between a normalmetal and a superconductor in the Andreev regime. The zero bias peak emerges insome nanowires when a magnetic field larger that the lead bulk critical fieldis applied. This field drives one of the electrodes into the normal state whilethe other, the tip, remains superconducting on its apex. Meanwhile atopological superconducting state appears in the connecting nanowire ofnanometric size.

Majorana Fermions in Topological Superconducting Metallic Nanowires probed by a Superconducting Condensate