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

  Moty Heiblum  
Department of Condensed Matter Physics, Weizmann Institute of Science

Majorana fermions are the only fermionic particles that are expected to be their own antiparticles. Although elementary particles of the Majorana type have not been identified yet, quasi-particles with Majorana-like properties, born from interacting electrons in the solid, have been predicted to exist. I will present results of experimental studies of a system composed of an aluminium superconductor in proximity to an indium arsenide nanowire, with the latter possessing strong spin-orbit coupling and Zeeman splitting. An induced one-dimensional topological superconductor,

supporting Majorana fermions at both ends, is expected to form.

I will concentrate on the characteristics of a distinct zero-bias conductance peak and its splitting in energy - both appearing only with a small magnetic field applied along the wire. The zero-bias conductance peak was found to be robustly tied to the Fermi energy over a wide range of system parameters. Although not providing definite proof of a Majorana state, the presented data and the simulations support its existence.