  Following our previous results, which provide evidence for the emergence of a
chiral p-wave triplet-pairing component in superconducting Nb upon the
adsorption of chiral molecules, we turned to investigate whether such an effect
can take place in a proximal superconductor consisting of metal on
superconductor bilayer. Note that in such proximity systems, correlated
electron-hole (Andreev) pairs exist in the normal metal rather than genuine
Cooper pairs. To that end, we used scanning tunneling spectroscopy (STS) on
thin Au films grown in-situ on NbN (a conventional s-wave superconductor)
before and after adsorbing helical chiral, alpha-helix polyalanine molecules.
The tunneling spectra measured on the pristine Au surface showed conventional
(s-wave like) proximity gaps. However, upon molecules adsorption the spectra
significantly changed, all exhibiting a zero-bias conductance peak embedded
inside a gap, indicating unconventional superconductivity. The peak reduced
with magnetic field but did not split, consistent with equal-spin
triplet-pairing p-wave symmetry. In contrast, adsorption of non-helical chiral
cysteine molecules did not yield any apparent change in the order parameter,
and the tunneling spectra exhibited only gaps free of in-gap structure.
