Following our previous results [1] that provide evidence for the emergence of a triplet-pairing chiral p-wave superconducting component in Nb upon the adsorption of chiral molecules, we turned to investigate whether such an effect can take place in other superconductor systems. First we addressed a proximal superconductor, namely, a thin Au film proximity-coupled to NbN. By applying scanning tunneling spectroscopy (STS) we found that the conventional BCS-like spectra measured on the pristine Au layer changed significantly after the adsorption of chiral polyalanine alpha-helix molecules, exhibiting now a zero-bias conductance peaks embedded inside a gap. The peak reduced in size, but did not split, upon the application of magnetic field. These results suggest the emergence of unconventional superconductivity with sign-changing order-parameter, consistent, here too, with triplet-pairing p-wave symmetry. Next, we performed conductance measurements on thin NbSe₂ flakes exfoliated over Au electrodes before and after chiral molecules adsorption. Upon adsorption, the conventional differential conductance spectra change their shape markedly, exhibiting in gap structures. At large molecule densities the spectra exhibited a pronounced narrow zero bias conductance peak, while at low density a pair of peaks symmetrically positioned around zero bias appeared. The former reduced in size and vanished upon the application of magnetic field, leaving only the conventional gap, consistent with an unconventional sub-dominant superconducting components, while the latter pair of peaks shifted with magnetic field, conforming to the behavior of Shiba states.  

[1] H. Alpern, E. Katzir, S. Yochelis, N. Katz, Y. Paltiel, and O. Millo, New J. Phys. 18, 113048 (2016)