Scanning Tunneling Spectroscopy on Epitaxial Thin film grown on s-wave Superconductor

Abstract

Proximity-Induced superconductivity on semiconducting thin film grown on s-wave superconductor has been studied using scanning tunneling microscopy and spectroscopy. Using a superconducting tip, hence forming SIS tunneling junction, we could obtain the energy resolution of spectrum down to 30 uV at the measurement temperature of 2.4 K. In this talk, we discuss a possible topological superconducting state that emerges at the surface of this heterostructure.