In this work, we report unconventional superconducting properties of high quality Au(111)/Nb heterostructure samples. We carry out tunneling studies in Au(111) using planar tunneling devices with a highly transparent barrier, which enhances the energy resolution of tunneling spectroscopy and allows us to observe and analyze fine in-gap states. We show a locally enhanced Zeeman field due to a large Landé g-factor at the barrier/Au(111) interface, and a broken of Pauli limit at the surface of Au(111) while maintaining bulk superconductivity. We will also show tunneling results along nanowires of magnetic insulators coupled to Au(111). Our work paves the way for searching and confirming robust topological superconductivity in the Au(111) platform.
Majorana zero modes (MZMs) are expected to emerge in material heterostructures combining superconductivity, ferromagnetism, and spin-orbit coupling (SOC). Particularly, inducing superconductivity and magnetic exchange interactions in well-defined Shockley surface states (SS) of high quality ultrathin Au(111) layers, which intrinsically have strong SOC, has been predicted as an excellent platform for MBS. In this talk, I will first present our success in creating such heterostructure in epitaxially grown Au(111) heterostructures. By means of electron tunneling spectroscopy, I will show signatures of superconductivity induced in the two-dimensional SS of Au(111) thin film, as well as the behavior of such superconducting state under a planar Zeeman field. Second, I will show the evidence of a pair of MZMs in a fabricated Au(111) nanowire system. I will also demonstrate the scalability of such system and why it will enable future MZMs braiding circuit.
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