InAs/Al Platforms for Quantum Transport in Semiconductor/Superconductor Hybrid Materials

Abstract:
Hybrid materials, combining InAs and aluminum, have recently been employed to explore various physical processes related to semiconductor-superconductor interfaces. The ongoing search for a condensed matter analogy to Majorana fermions, although recently met with some skepticism, have significantly contributed to refining our understanding of quantum transport phenomena in these material systems. This research has also led to their implementation in experiments related to Andreev physics, transmon qubits, and scalable multi-terminal hybrid devices.

I will focus on introducing three main InAs/Al platforms compatible with growth technology, expertise, and device fabrication processes at the Institute of Physics: vapor-liquid-solid grown nanowires, selectively area grown nanowires, and hybrid shallow 2DEGs. The advantages and disadvantages of these materials will be discussed in the context of recent experimental results, with emphasis on their compatibility with multi-terminal device schemes.