High magnetic field compatible nanowire hybrids (part I): Conductance spectroscopy*

Semiconductor nanowires coupled to superconductors are promising candidates for realizing topological superconductivity in solid state systems. The first generation of nanowire-superconductor devices utilized Nb based alloys with large superconducting gaps providing opportunity to operate at high magnetic fields and temperatures. Due to the soft gap, Nb-based superconductors were subsituted with Aluminum. As a result, hard gap and parity conserving transport are commonly observed in III-V/Al hybrids. A limiting factor for Al based systems is a rather narrow parameter space defined by small superconducting gap and resulting modest magnetic field resilience. I will discuss opportunities for increasing field compatibility of InSb/Al hybrids by lifting the Pauli limit within the superconducting segment. Furthermore, I will present how such an approach can be utilized for reaching critical field values doubling the values reported so far. Finally, I will present results of conductance spectroscopy of InSb/Al nanowire devices taken at high magnetic fields.