End States and Subgap Structure in Proximity-Coupled Chains of Magnetic Adatoms
End States and Subgap Structure in Proximity-Coupled Chains of Magnetic Adatoms
A recent experiment [Nadj-Perge et al., Science 346, 602 (2014)] provides evidence for Majorana zero modes in iron (Fe) chains on the superconducting Pb(110) surface. Here, we study this system by scanning tunneling microscopy using superconducting tips. This high-resolution technique resolves a rich subgap structure, including zero-energy excitations in some …