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Majorana fermions are the only fermionic particles that are expected to betheir own antiparticles. While elementary particles of the Majorana type werenot identified yet, quasi-particles with Majorana like properties, born frominteracting electrons in the solid, were predicted to exist. Here, we presentthorough experimental studies, backed by numerical simulations, of a systemcomposed of an aluminum superconductor in proximity to an indium arsenidenanowire, with the latter possessing strong spin-orbit coupling. An induced 1dtopological superconductor - supporting Majorana fermions at both ends - isexpected to form. We concentrate on the characteristics of a distinct zero biasconductance peak (ZBP), and its splitting in energy, both appearing only with asmall magnetic field applied along the wire. The ZBP was found to be robustlytied to the Fermi energy over a wide range of system parameters. While notproviding a definite proof of a Majorana state, the presented data and thesimulations support strongly its existence.

Evidence of Majorana fermions in an Al - InAs nanowire topological superconductor