  Under certain conditions, a fermion in a superconductor can separate in space
into two parts known as Majorana zero modes, which are immune to decoherence
from local noise sources and are attractive building blocks for quantum
computers. Promising experimental progress has been made to demonstrate
Majorana zero modes in materials with strong spin-orbit coupling proximity
coupled to superconductors. Here we report signatures of Majorana zero modes in
a new material platform utilizing the surface states of gold. Using scanning
tunneling microscope to probe EuS islands grown on top of gold nanowires, we
observe two well separated zero bias tunneling conductance peaks aligned along
the direction of the applied magnetic field, as expected for a pair of Majorana
zero modes. This platform has the advantage of having a robust energy scale and
the possibility of realizing complex designs using lithographic methods.
