High magnetic field compatible nanowire hybrids (part II): exploring bulk induced superconductivity*

Semiconductor nanowires coupled to superconductors are promising candidates for realizing topological superconductivity in solid state systems. We have developed a technique which increases the field compatibility of InSb/Al hybrids dramatically, of which the basic characterization is discussed in the previous talk (Conductance spectroscopy of high magnetic field compatible nanowire hybrids (part I)). In this work, we go beyond standard density-of-states spectroscopy. In a 3-terminal geometry, we explore the induced superconductivity in the bulk of these hybrids by means of non-local conductance measurements. At the two ends of the superconducting section, we use local spectroscopy to probe the density of states in the nanowire. At the same time, we measure the non-local signal and track the evolution of the induced gap in the bulk of the nanowire as a function of magnetic field and gate voltage. Crucially, the combination of high-mobility semiconducting wires and a field-resilient superconductor allows us to operate these hybrids at magnetic fields which are uniquely accessible in our system.